Fertilization techniques of summer sesame
In order to get a higher yield of summer sesame, it is necessary to apply nitrogen, phosphorus and potassium fertilizer skillfully. When fertilizing, we should pay attention to grasp the principles of stability, accuracy and ruthlessness.
As soon as it is stable, that is, fertilization at the seedling stage should be stable. The growth of summer sesame seedlings is slow, and the ability of roots to absorb nutrients is weak. If the basal fertilizer is insufficient, the seedlings will be thin, so we should apply the fertilizer as soon as possible, but the amount of fertilizer should be small, otherwise it is easy to cause tall seedlings.
The second criterion, that is, topdressing in the bud stage should be accurate. The growth rate of summer sesame is obviously accelerated from budding to early flowering stage. at this time, topdressing can promote flower bud differentiation and increase the number of capsules.
Three ruthlessness, that is, it is necessary to be ruthless in the flowering period. From flowering to maturity, summer sesame seeds bloom, form capsules and mature, and the demand for fertilizer increases sharply. Topdressing in this period can not only reduce the tip and blighted grains of summer sesame, but also increase the weight of 1000 grains. It is generally required that topdressing at full flowering stage should be early and should be applied in two stages: 2 kg of pure nitrogen per mu 10 days after the first flowering and 3 kg of pure nitrogen per mu 10 days after capsule formation. In order to meet the large demand for phosphorus and potash fertilizer at full bloom, 2 kg of phosphate fertilizer, 1 kg of potassium fertilizer and 50 kg of water can be used per mu, and the clear liquid can be sprayed after mixing.
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Weeding in Summer Sesame Field
Summer sesame seedling stage is in high temperature and rainy season, the root system is few, the growth is weak, and the weeds emerge quickly, the density is large, the growth is vigorous, and the sesame seedlings are easy to cover and form grass shortage, so the corresponding herbicides should be selected at different stages for elimination. 1. Soil sealing treatment after sowing and before seedling emergence. After sesame seeds are sown, spray 50% acetochlor EC 100ml or Dur (72% metolachlor EC) 200ml with 50kg water evenly on each mu to control many kinds of annual grass weeds such as Setaria, Digitaria, Alopecurus chinensis and Eleusine grass, etc.
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How to apply fertilizer in the middle and late growth of summer sesame seeds
In order to improve the quality of sesame seeds, high yield cultivation of summer sesame seeds should be carried out by applying heavy and shallow base fertilizer, proper amount of seed fertilizer, heavy bud fertilizer, supplementary spraying of phosphorus and potassium fertilizer, mainly organic fertilizer, combined application of phosphorus and potassium fertilizer, and reducing the amount of chemical fertilizer as much as possible. The fertilizer requirements for each 100 kg sesame production are: N 6.24~8.13 kg, P 2.19~3.28 kg, K 6.24~10.19 kg. However, in summer sesame planting in our province, most farmers do not apply base fertilizer, topdressing is only urea or less
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