Indonesia UAV Fertilization Guide: Precise Fertilizing for Different Seeds & Oil Palm

In the rapid development of smart agriculture, Indonesia UAV fertilization has long been rid of the single label of "fertilizer spreading tool" and has become a core modern agricultural technology that balances efficiency, environmental protection and precision. It is perfectly suitable for various planting scenarios in key agricultural regions of Indonesia, such as Java (Banten, West Java), Sumatra (North Sumatra, Jambi), Kalimantan (East Kalimantan, West Kalimantan), Bali and Sulawesi, effectively solving the pain points of "uneven, labor-intensive and wasteful" traditional manual fertilization—especially critical for Indonesia, a country with high dependence on imported fertilizers (annual demand exceeds 13 million tons, while domestic output is only about 3.5 million tons). With the advantages of low-altitude hovering, precise quantity control and strong terrain adaptability, it can customize exclusive fertilization plans according to the growth needs of different regions and different seeds. After all, the "appetites" of Java rice, Sumatra corn, Kalimantan oil palm, Bali fruits and vegetables, and Sulawesi mountain characteristic crops are completely different. Blind fertilization not only wastes agricultural materials, but also affects crop growth and yield. Today, we will popularize the core logic of UAV fertilization in Indonesia, and disassemble the scientific fertilization skills for different types of seeds combined with the planting characteristics of Java, Sumatra, Kalimantan and other key regions in Indonesia, helping farmers in various parts of Indonesia achieve precise fertilization, improve quality and increase income, and respond to the government's call for improving fertilizer use efficiency.

Many people think that UAV fertilization is just "air fertilization", but in fact, it is a systematic project of "load adaptation + precise control + scene adaptation". The core is to achieve "on-demand fertilization and precise delivery" through technical means. This is the key reason why it can adapt to multiple regions and terrains in Indonesia such as Java's plains, Sumatra's hills, Kalimantan's mountainous areas and paddy fields, and is more advantageous than traditional fertilization. At present, Indonesia drone fertilization technology has been widely applied to major Indonesian islands such as Java, Sumatra, Kalimantan and Bali, with a total service area of over 1 million mu [1], and has been adopted in the 100,000-hectare corn planting plan in Yogyakarta Special Region, combined with IoT intelligent monitoring systems to provide scientific basis for precise fertilization.

From the perspective of technical principles, UAV fertilization is mainly divided into two modes: solid fertilization (spreading granular fertilizer) and liquid fertilization (spraying liquid fertilizer/foliar fertilizer), which rely on three core modules: first, the flight platform. Multi-rotor UAVs are flexible and suitable for small plots and complex terrains such as Sulawesi mountainous areas and Kalimantan hilly areas, while fixed-wing UAVs are efficient and suitable for large-scale plain field operations in Java (West Java, Central Java) and Sumatra (North Sumatra, South Sumatra); second, the fertilization system. Solid fertilization controls density through centrifugal spreading devices, and liquid fertilization adjusts droplet size through atomizing nozzles to avoid fertilizer drift, which is suitable for operations in areas with obvious wind seasons such as Sumatra and Java, and also adapts to Indonesia's volatile monthly precipitation (monthly precipitation is often less than 180mm during the dry season from July to September); third, the precise control system. Through GNSS positioning (error ≤ 2cm) and flight control system, it can independently plan routes, fix height and speed, ensuring "no re-spraying or missing spraying". For example, the relevant technology of local Indonesian agricultural technology enterprises can achieve square-meter-level variable fertilization with an error within ±5% [1], and AI-driven agricultural UAVs can also be equipped with multispectral imaging technology to monitor crop health and pest infestations, further improving fertilization precision.

Compared with traditional manual and mechanical fertilization, the core advantages of UAV fertilization are reflected in three points: first, high efficiency. A single UAV can operate 300-500 mu per day, and some high-efficiency models can reach 600 mu per day, which is 30-200 times that of manual work [1], suitable for large-scale planting areas such as Java's rice fields and Sumatra's corn fields—critical for Indonesia, where 80% of cultivated land is family-run and 70% of individual farmers have less than 1 hectare of land, making mechanization difficult; second, high precision. It can dynamically adjust the fertilization amount according to the soil fertility and seed growth stage in different regions, and the fertilizer utilization rate is increased by more than 25%. The application in Banten Province, Java can save about 15% of costs [2], helping to alleviate the pressure of high fertilizer import dependence [1]; third, strong adaptability. It can easily operate in plain fields in Java and Sumatra, mountain terraces in Sulawesi and Nusa Tenggara Islands, as well as paddy fields and palm plantations in Kalimantan, avoiding crop damage caused by mechanical rolling and root damage caused by manual treading [4] [5], and also providing effective solutions for pest control in palm plantations, such as bagworm infestations.

Indonesia, known as the "country of ten thousand islands", has obvious regional differences in climate and soil. Java, as the most populous island (accounting for nearly 55% of the national population), is dominated by plain agriculture and is the main production area of rice and wheat; Sumatra, with rich hilly land, is a key base for corn and oil palm; Kalimantan, with vast mountainous and paddy fields, focuses on oil palm and rice planting; Bali is famous for its fruits and vegetables and rapeseed. The type of seed determines the growth cycle, root distribution and fertilizer demand rule of the crop, and regional differences (soil fertility, climate conditions) further affect the fertilization plan. Some seeds like nitrogen and need early growth promotion, which are suitable for major rice and wheat producing areas such as Java (Banten, West Java) and Sumatra (North Sumatra); some seeds like potassium and focus on fruit strengthening in the later stage, which are suitable for fruit, vegetable and palm producing areas such as Bali and Java (East Java); some seeds have low fertilizer demand and need precise control to avoid seedling burning, which are suitable for mountainous characteristic crop producing areas such as Sulawesi and Nusa Tenggara Islands. The core advantage of Indonesia UAV fertilization is that it can accurately match these differences, allowing every seed to "eat the right fertilizer, eat enough fertilizer and avoid waste". Below, we will disassemble the specific UAV fertilization plans according to the seed types and combined with the planting characteristics of Java, Sumatra, Kalimantan and other key regions in Indonesia.

Grain seeds (rice, corn, wheat, etc.) are the main application scenarios of UAV fertilization in Indonesia, mostly large-scale planting. They are widely planted in Java (West Java, Central Java), Sumatra (North Sumatra, South Sumatra), Kalimantan (East Kalimantan, South Kalimantan) and Sulawesi and other regions. It is necessary to balance efficiency and yield. The core is to accurately supply nitrogen, phosphorus, potassium and trace elements according to the Indonesian regional climate (tropical monsoon climate, dry and rainy seasons) and the peak fertilizer demand period of the growth period. UAV fertilization for grain crops in Indonesia has become the first choice for large-scale farmers and government-supported agricultural projects due to its high efficiency and precision, helping to improve national food self-sufficiency rate [2].

Wheat has a long growth period (220-250 days) and a large demand for fertilizer. To produce 100 kg of grains, it needs to absorb 2.8-3.1 kg of pure nitrogen, 1.2-1.5 kg of phosphorus pentoxide and 2.9-3.3 kg of potassium oxide, with a ratio of about 3:1:3. It follows the principle of "emphasizing base fertilizer and skillfully applying topdressing", which is suitable for the climate characteristics of major wheat producing areas such as Banten Province in Java and North Sumatra Province in Sumatra. These areas have moderate rainfall and suitable temperature, and need key topdressing during the spring regreening and jointing period [2], especially to cope with the dry season drought impact [1].

UAV fertilization plan: ① Base fertilizer stage (before sowing): Adopt solid fertilization mode, select compound fertilizer with balanced nitrogen, phosphorus and potassium ratio. The UAV flight height is controlled at 2-3 meters, the speed is 3-4m/s, and the spreading uniformity is kept above 90%. For high-yield fields in Java (Banten, West Java) and Sumatra (North Sumatra), apply 40-60 kg of compound fertilizer per mu, combined with organic fertilizer for better effect, laying a foundation for wheat emergence and tillering; ② Topdressing stage: In the regreening period, use liquid fertilization mode to spray high-nitrogen compound fertilizer solution, apply 20-25 kg per mu in Java, Sumatra and other places to promote effective tillering. Local farmers can also use multispectral UAV to monitor seedling condition and apply variable fertilization according to local conditions [2], which is also widely used in Yogyakarta's corn planting plan [1]; In the jointing period, increase the application of high-nitrogen compound fertilizer, 25-30 kg per mu, to enhance lodging resistance, adapting to the wind season characteristics of Sumatra and Java; In the booting to filling period, spray 1% urea + 0.2% potassium dihydrogen phosphate foliar fertilizer to extend the functional period of leaves and improve the thousand-grain weight, alleviating the impact of dry season on yield [1].

Note: Phosphorus is crucial for wheat seedling stage. When applying UAV fertilization, the supply of phosphorus can be appropriately increased; Potassium is supplemented in the later stage to avoid premature senescence. Avoid flying in strong wind weather to prevent fertilizer drift.

Rice is the staple food crop in Indonesia, and the Indonesian government has been focusing on improving rice yield [2]. To produce 100 kg of rice, it needs 1.6-2.5 kg of nitrogen, 0.8-1.2 kg of phosphorus and 2.1-3.0 kg of potassium, with a ratio of about 2:1:3. It has high demand for two trace elements, silicon and zinc. Silicon can enhance lodging resistance, and zinc can reduce the empty grain rate, adapting to the rice planting needs under the tropical monsoon climate in Indonesia (plenty of rain in rainy season, dry in dry season). UAV rice fertilization in Indonesia can effectively improve fertilizer utilization and reduce water loss, which is especially suitable for paddy fields in Java and Kalimantan.

UAV fertilization plan: ① Seedling stage (seedling raising stage): Adopt liquid fertilization mode, spray diluted compound fertilizer solution, 20-30 kg per mu. Apply "sending-off fertilizer" 4-5 days before transplanting, 6-7 kg of urea per mu to help seedlings turn green quickly after transplanting; ② Field stage: Use solid fertilization for base fertilizer, apply 2000-3000 kg of decomposed organic fertilizer + 20-30 kg of compound fertilizer per mu, combined with deep ploughing and spreading—suitable for Java's fertile plain paddy fields and Kalimantan's water-rich paddy fields; Apply urea for topdressing in the tillering period, 5-10 kg per mu (single-cropping rice in Sumatra (South Sumatra)) or 10-15 kg per mu (double-cropping rice in Java (West Java, Central Java)); In the panicle differentiation to heading period, focus on supplementing potassium, apply 10-15 kg of high-nitrogen compound fertilizer per mu, and spray zinc fertilizer at the same time to avoid yield impact caused by nutrient deficiency, helping to achieve the government's rice yield improvement target [2].

Note: Rice is mostly planted in paddy fields. The UAV flight height is controlled at 3-4 meters to avoid excessive droplets splashing into water and causing loss; In hilly areas of Kalimantan (East Kalimantan, West Kalimantan) and Sulawesi, routes can be planned along contour lines. For every 5° increase in slope, the flight height is reduced by 0.5 meters.

Corn is an important grain crop in Indonesia, especially in Sumatra's hilly areas and Kalimantan's mountainous areas. Corn has the fertilizer demand characteristics of "high nitrogen, high potassium and medium phosphorus". Spring corn needs 3.5-4.0 kg of nitrogen and 5-6 kg of potassium to produce 100 kg of grains, while summer corn needs 2.5-2.7 kg of nitrogen and 3.7-4.2 kg of potassium. The jointing and big bell mouth stages are the peak fertilizer demand periods, and it likes zinc element, adapting to the corn growth needs under the tropical climate in Indonesia, especially coping with the drought and pest problems in the dry season [1].

UAV fertilization plan: ① Base fertilizer stage: Adopt solid fertilization, apply 2000-3000 kg of organic fertilizer + 30-40 kg of compound fertilizer (nitrogen-phosphorus-potassium ratio 15-15-15) per mu. When spreading by UAV, control the particle size at 2-5mm to avoid blocking the equipment—suitable for large-scale corn fields in Sumatra (North Sumatra) and Kalimantan (South Kalimantan); ② Topdressing stage: Apply light seedling-promoting fertilizer, 5-10 kg of urea per mu, sprayed in liquid; Apply early stem-strengthening fertilizer, 15-20 kg of high-nitrogen compound fertilizer per mu; Apply heavy panicle-promoting fertilizer, 20-25 kg of high-nitrogen and high-potassium compound fertilizer per mu. The UAV flight speed is 4-6m/s, and the spreading width is controlled at 5-8 meters to ensure that the fertilizer evenly covers the corn canopy; Supplement zinc fertilizer in the later stage to improve grain plumpness, which is also combined with multispectral monitoring to prevent pest damage [1].

Economic crop seeds (oil palm, soybean, peanut, fruits and vegetables, etc.) are the pillar of Indonesia's agricultural economy [2], especially oil palm—Indonesia is the world's largest palm oil producer, with a planting area of about 9.2 million hectares in 2010, and exports account for 40% of the world [3]. These crops are either small in grain size, require precise fertilization, or have special growth environments. UAV fertilization needs to focus on "precision and flexibility" to avoid crop damage or waste of agricultural materials, adapting to the characteristics of economic crop planting in various regions of Indonesia. Among them, oil palm, as the core economic crop in Indonesia, is widely planted in Sumatra (Jambi, North Sumatra) and Kalimantan (East Kalimantan, West Kalimantan)—the Indonesian government has established palm oil industrial concentration zones in these four regions [3], and it is necessary to customize exclusive UAV fertilization plans according to its growth cycle. Indonesia oil palm UAV fertilization is the key to improving oil palm yield and quality, and also helps to narrow the gap between Indonesia's palm oil production efficiency (3.8t/hm2) and Malaysia's (4.6t/hm2) [3].

Oil palm is the most representative economic crop in Indonesia, mainly distributed in tropical rainy areas such as Jambi Province in Sumatra and East Kalimantan Province in Kalimantan—these regions are key palm oil industrial concentration zones designated by the Indonesian government [3]. It has a long growth cycle (economic production period can reach 25-30 years), large and long-term fertilizer demand. The core fertilizer demand characteristics are "promoting growth in the early stage, stabilizing nutrition in the middle stage, and emphasizing potassium and magnesium in the later stage". The ratio of nitrogen, phosphorus and potassium is about 1:0.3:1.5. At the same time, it is necessary to supplement trace elements such as magnesium, boron and zinc to avoid leaf yellowing and low fruit setting rate caused by nutrient deficiency. UAV fertilization for oil palm in Indonesia can effectively solve the problem of uneven fertilization in large-scale plantations, and some large palm plantations have introduced AI-driven UAVs that can switch between liquid spraying and granular spreading systems for multi-functional operations [1].

UAV fertilization plan: ① Seedling stage (1-2 years, non-fruiting stage): Adopt liquid fertilization mode, adapt to multi-rotor UAV. The flight height is 2.5-3 meters, the speed is 3-4m/s. Select high-nitrogen compound fertilizer solution, apply 15-20 kg per mu, spray once a month to promote the root growth and stem thickening of oil palm seedlings. In the seedling stage in Sumatra (Jambi, North Sumatra), the phosphorus element can be appropriately increased to adapt to the local acidic soil; ② Young production stage (3-4 years, initial fruiting stage): Combine solid and liquid. Base fertilizer selects nitrogen-phosphorus-potassium compound fertilizer (ratio 15-5-15), spread by UAV in solid form, 30-40 kg per mu, once every 3 months; Spray liquid potassium fertilizer once a month during the growth period, 10-15 kg per mu, combined with magnesium fertilizer to improve leaf photosynthesis—critical for oil palm growth in Kalimantan's rainy environment; ③ Full production stage (more than 5 years, high-yield stage): Focus on supplementing potassium and magnesium. Solid fertilization selects high-potassium compound fertilizer (ratio 10-5-20), 40-50 kg per mu, spread once every 2 months, adapting to large-scale operation of oil palm plantations in Sumatra (Jambi, North Sumatra) and Kalimantan (East Kalimantan, West Kalimantan)—these regions account for the main output of Indonesia's palm oil [3]; In the flowering and fruiting periods, spray boron fertilizer + zinc fertilizer in liquid form, 0.5-1 kg of boron fertilizer and 0.3-0.5 kg of zinc fertilizer per mu. When the UAV is flying, bypass the top of the oil palm canopy and spray directly on the middle and lower leaves to improve absorption efficiency; ④ Senescence stage (more than 20 years): Reduce the amount of nitrogen fertilizer, increase phosphorus and potassium fertilizers, 25-30 kg of compound fertilizer per mu, to extend the economic production period, in line with the Indonesian government's policy of encouraging the development of the palm oil industry [3].

Note: Most oil palm plantations are mountainous or sloping land. UAVs need to plan routes along contour lines, and the flight height is adjusted according to the slope (slope ≤ 15°, height 3 meters; slope 15°-30°, height 2.5 meters) to avoid fertilizer drift; Avoid operation 24 hours before rainfall during the rainy season in Indonesia to prevent fertilizer from being washed away by rainwater; In the full production period, regularly use multispectral UAV to monitor the leaf nutrition status and dynamically adjust the fertilization amount, which can also help predict pest infestations such as bagworms [1].

Rapeseed grains are small and light, with extremely low sowing rate. The sowing rate of conventional rapeseed is 0.3-1.0 kg per mu, and that of hybrid rapeseed is only 0.1-0.2 kg per mu. It is necessary to accurately control the fertilization amount to avoid over-dense sowing or drift, adapting to the rapeseed planting scenarios in Java (East Java) and Bali—these regions have suitable climate and soil for rapeseed growth, and are important rapeseed production bases in Indonesia.

UAV fertilization plan: Select a small auger (small pitch and dense blades) to adapt to the sowing of small-grain seeds; The flight height is controlled at 2-3 meters, and the speed does not exceed 4m/s to avoid seed drift caused by excessive wind speed; Base fertilizer selects sulfur-based compound fertilizer, 20-30 kg per mu, spread in solid form; Spray liquid nitrogen fertilizer at the seedling stage, 5-8 kg per mu to promote seedling growth; Supplement boron fertilizer in liquid form at the flowering stage to improve the pod setting rate and avoid flower abortion.

Soybeans and peanuts are important economic leguminous crops in Indonesia, widely planted in Sumatra (South Sumatra) and Kalimantan (South Kalimantan). They can fix nitrogen by themselves. Their fertilizer demand characteristics are "less nitrogen, more phosphorus and potassium". Excessive nitrogen fertilizer is avoided to prevent excessive growth. They like molybdenum and boron elements. Molybdenum can promote root nodule development, and boron can promote flowering and pod setting, adapting to the soil conditions and tropical climate in Sumatra and Kalimantan, and also suitable for intercropping with oil palm—a common planting mode in Indonesia [1].

UAV fertilization plan: ① Base fertilizer: Solid fertilization, apply 1500-2000 kg of organic fertilizer + 20-30 kg of compound fertilizer mainly composed of phosphorus and potassium per mu, reducing the amount of nitrogen fertilizer to adapt to the local acidic soil; ② Topdressing: Spray a small amount of nitrogen fertilizer (3-5 kg per mu) at the seedling stage to avoid nitrogen deficiency; In the flowering and pod setting period, spray phosphorus and potassium fertilizers + boron fertilizer in liquid form, 10-15 kg of phosphorus and potassium fertilizers and 0.5-1 kg of boron fertilizer per mu. The UAV flight height is 3-4 meters, spraying directly on the crop canopy to avoid damaging petals; Supplement molybdenum fertilizer in the later stage to improve nitrogen fixation efficiency and increase yield, helping farmers increase income under the support of the Indonesian government's agricultural policies [2].

Note: Soybeans and peanuts are mostly intercropped with oil palm (a common planting mode in Indonesia). When applying UAV fertilization, adjust the route to avoid oil palm plants and prevent fertilizer from being sprayed on oil palm leaves to cause fertilizer damage; Choose early morning or evening for operation in high temperature seasons to reduce the evaporation of liquid fertilizer, adapting to Indonesia's tropical high temperature climate.