How to apply fertilizer in the middle and late growth of summer sesame seeds

In the high-yield cultivation of summer sesame, it is necessary to apply heavy and shallow base fertilizer, appropriate seed fertilizer, flower bud fertilizer, phosphorus and potassium fertilizer, and mainly organic fertilizer combined with phosphorus and potassium fertilizer to reduce the amount of chemical fertilizer as far as possible to improve the quality of sesame. The amount of fertilizer required for every 100 kg production of sesame: nitrogen fertilizer 6.24 kg 8.13 kg, phosphorus fertilizer 2.19 kg 3.28 kg, potash fertilizer 6.24 kg 10.19 kg.

However, in summer sesame planting in our province, most farmers do not apply base fertilizer, and topdressing only applies urea or a small amount of compound fertilizer. The unreasonable application of fertilizer seriously affected the potential of sesame yield increase.

At present, summer sesame in various parts of our province has entered the middle stage of growth, so we must pay close attention to the fertilizer management in the middle and later stage so as to increase production and income.

Topdressing base fertilizer: for fields that do not apply base fertilizer, it is necessary to seize the time to top fertilizer to prevent de-fertilization. For high-yield fields, 10 kg of high-quality potassium sulfate compound fertilizer is applied per mu, and the depth of shallow burial is 4-6 cm; for medium-and low-yield fields, 10 kg of high-quality potassium sulfate compound fertilizer and 5 kg of urea are applied per mu.

Re-application of flower bud fertilizer: for fields where base fertilizer has been applied, flower bud fertilizer should be re-applied. For single-culm sesame, when flower bud fertilizer is applied from bud to early flowering stage, those with weak soil fertility or poor growth should be applied early, while branch sesame should be applied when branches appear. Generally, 5kg of urea is applied per mu, 5kg of high quality potassium sulfate compound fertilizer is added, or 10kg of high quality potassium sulfate compound fertilizer is applied per mu.

Supplementary spraying of phosphorus and potassium fertilizer: in the early flowering stage of summer sesame, 50 kg of potassium dihydrogen phosphate solution of 0.3%-0.4% per mu was sprayed evenly once every 5-6 days for 2 times. At the same time, borax, ammonium molybdate solution or zinc sulfate solution can be sprayed at intervals of 50 kg per mu, and the yield can be increased by more than 10% per mu. The general concentration of borax spraying is 0.2%, ammonium molybdate is 0.05%, and zinc sulfate is 0.2%.