Molybdenum deficiency control measures in soybean
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First, apply molybdenum fertilizer using ammonium molybdate, which is the most commonly used form. For each kilogram of soybean seeds, only 2 grams of ammonium molybdate should be used. To prepare the solution, dissolve the fertilizer in five times its weight in hot water, stir thoroughly, let it cool, and then apply it to the soil. Another method involves foliar spraying during the flowering period, using a solution with a concentration of 0.005% to 0.01%. This should be done at least twice to ensure effective absorption.
In acidic soils, where molybdenum deficiency is less common, adding lime can help reduce soil acidity and improve molybdenum availability. It's important to note that molybdenum is typically applied through root dressing rather than directly into the soil, as this allows for better control of the dosage. If soil application is necessary, mix 200 grams of molybdenum fertilizer with organic manure and apply it per acre. Avoid repeating this practice in the same field year after year to prevent buildup or imbalances.
Before applying molybdenum, it's crucial to check if the soil lacks phosphorus. If phosphorus levels are low, phosphate fertilizer should be used alongside molybdenum, as applying molybdenum alone may reduce the number of root nodules. Additionally, excessive use of chemical nitrogen fertilizers can also inhibit nodule formation, leading to fewer nodules, smaller growths, and reduced nitrogen fixation efficiency.
Phosphorus plays a key role in the development of root nodules and nitrogen fixation in soybeans. It not only supports root growth but also enhances nodule development and their ability to fix atmospheric nitrogen. Therefore, when growing legumes, it's essential to apply phosphate fertilizer to boost nitrogen fixation and achieve a balanced "nitrogen-phosphorus" effect. This approach ensures healthier plants and better yields.