Non-continuous cropping soybean
Soybeans are commonly known as soybeans, and farmers have the traditional habit of planting soybeans this year and next year, resulting in slow growth, dwarfism, yellowing of leaves, easy infection of diseases and insect pests, fewer pods and small seeds, and a significant decrease in yield. According to the survey, under normal circumstances, the yield of soybean is reduced by 20%, 30% or more, and the main reasons for the reduction are as follows:
Diseases and insect pests are prone to several diseases parasitized by soybean, such as bacterial spot, black spot, bacterial blight, yellow blight, etc., which are bound to occur in a large number of soybean continuous cropping soil, especially nematode disease.
The toxic effect of root microbial exudates soybean roots can secrete some acidic substances and form some toxic substances, such as ferrous salts, which are left in the soil, so that the normal process of nutrition and metabolism of continuous cropping soybean is affected, the root system is underdeveloped, the activity of rhizobium is weakened, plant growth is inhibited, resulting in reduced yield.
Excessive consumption of nutrition due to excessive consumption of phosphorus nutrition in the soil due to soybean continuous cropping, the imbalance of available nitrogen and phosphorus affects the growth of soybean, therefore, it is necessary to avoid continuous cropping in soybean production, and it is best to implement rotation with other crops for more than three years.
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Soybean is not suitable for continuous cropping.
The control technology of continuous cropping of soybean can slow down the effect on yield. The effect on soybean yield. Different environments have different effects on soybean yield. ① heavy cropping and light continuous cropping; heavy ② in the west and southwest and light in the north and east; heavy thin land and light fertilised land in ③; heavy slope in ④, light in low wet area; heavy dry year and young rain in ⑤; heavy no or less fertilization in ⑥, light in more fertilizer; heavy sowing in ⑦ and light in ploughing and renovation; heavy underground diseases and insect pests in ⑧, light in underground diseases and insect pests; ⑨ mature land is heavy, newly reclaimed land is light; ⑩ drought is heavy, irrigation is light. The East four League of Inner Mongolia Autonomous region and its
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Sowing technology of soybean
1. Soil preparation: (1) soil preparation before sowing: soil preparation before sowing includes soil tillage, raking, pressing, etc. Due to the use of different land preparation techniques, the work of land preparation before sowing is also different. Such as turning over, ridge cultivation, raking stubble, deep loosening and so on. (2) pre-sowing irrigation: for plots with poor soil moisture, if there are irrigation conditions, you can irrigate once 1-2 days before sowing and soak the soil to facilitate seed germination after sowing. (3) closed weeding before sowing: soybean planting in some large farms in the main soybean producing areas of Northeast China.
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