Groundnut is a profitable oilseed crop, but it needs balanced nutrition because the plant has to grow, flower, form pegs, and finally develop pods underground. Many farmers apply only basic fertilizers and then wonder why pod filling is poor or kernels are small. Good nutrient management in groundnut is not just about NPK. It also includes gypsum (calcium and sulphur), micronutrients, organic matter, and proper moisture management. When these are handled well, the crop gives better pod yield, higher oil content, and good market quality.
Start with soil preparation and organic matter. Groundnut performs best in loose, well-drained soil where pegs can enter easily and pods can develop without hardness. Apply well-decomposed farmyard manure or compost before sowing. Organic matter improves soil structure, increases moisture holding, and supports helpful microbes. Avoid fresh manure because it can encourage pests and diseases. Proper land preparation is important because hard clods reduce peg penetration and lead to fewer pods.
Seed treatment and Rhizobium inoculation are also good practices. Groundnut is a legume and can fix nitrogen, but nodules form better when the right bacteria are present in soil. Treating seed with suitable Rhizobium culture helps in better nodulation and reduces the need for high nitrogen fertilizer. In many fields, this step improves plant vigour and yield, especially where groundnut has not been grown for a long time.
For main nutrients, groundnut needs a balanced dose of nitrogen, phosphorus, and potassium. Nitrogen is needed only in small quantity as a starter dose because too much nitrogen will push leafy growth and reduce pod formation. Phosphorus is very important for strong root growth, better flowering, and peg formation. Potassium improves plant strength, drought tolerance, and helps in better pod filling. Apply these nutrients as basal at sowing so the young plant can use them early. In light soils, potassium becomes more important because nutrients leach easily.
Calcium and sulphur are critical nutrients for groundnut, especially for pod development. Many farmers do not realize that calcium is needed in the pod zone, not only in leaves. When calcium is low, pods may form but kernels remain shriveled or poorly filled. This problem is more common in sandy soils. Gypsum is the most common source used because it supplies both calcium and sulphur. A best practice is to apply gypsum around flowering or early pegging stage, usually about 30–40 days after sowing. This timing helps calcium reach the developing pods. If gypsum is applied too late, the benefit reduces.
Sulphur also improves oil formation and overall yield. If soils are sulphur deficient, groundnut plants may look pale and growth may be slow. Gypsum, single super phosphate, or other sulphur sources can correct it. Choose a sulphur source based on local availability and soil need.
Micronutrients should not be ignored. Zinc deficiency is common in many Indian soils and reduces growth and yield. Boron helps in flower and pod development. Iron deficiency can appear in alkaline soils as yellowing of young leaves. If deficiency symptoms are seen, foliar spray gives quick relief. But long-term correction needs soil application and organic matter improvement.
Irrigation and nutrient management go together. Groundnut is sensitive to waterlogging, which reduces nodulation and causes root diseases. Maintain good drainage. At the same time, moisture stress during flowering and pegging can reduce pod number. Give timely irrigation during critical stages like flowering, pegging, and pod filling. Avoid heavy irrigation at once; frequent light irrigation is better in sandy soils.
Another best practice is balanced fertilization, not over-fertilization. Too much nitrogen or excessive early irrigation encourages vegetative growth and increases pest pressure. Weeds also compete strongly in the first 30–40 days, so timely weeding helps the crop use nutrients better.
In short, best nutrient management in groundnut means good organic matter, Rhizobium seed treatment, balanced NPK with low nitrogen, gypsum application at flowering/pegging for calcium and sulphur, correction of micronutrients when needed, and proper irrigation without waterlogging. These practices support better peg formation, fuller pods, and higher yield with improved oil quality.
