Control measures of three diseases of soybean
Soybean root rot: the disease can occur and cause damage throughout the growth period of soybean, with a yield reduction of 25% to 75% or more. The protein content of the damaged seeds decreased obviously, and the main symptom was that the dark brown disease spot appeared at the base of the stem and spread upward to the lower lateral branches, which made the pith of the diseased stem brown, the base of petiole constricted and the leaves drooping, but did not fall off. The main application of chemical control is 58% Ruidu Manganese Zinc or 72% Kelu wettable powder, the dosage is 0.3% 0.4% seed dressing.
Soybean Sclerotinia sclerotiorum: soybean Sclerotinia sclerotiorum mainly infects the stem and begins to occur in late July. there are brown spots on the stems at the initial stage of infection, and then there are white cotton-like mycelium and white particles on the spot, and then turn black particles (sclerotia). In the longitudinal section of the stem of the diseased plant, the black cylindrical mouse fecal sclerotia could be seen, and the diseased plant was grayish white after death. Spray 50% sulfamethoxazole wettable powder 1000 times or 1000 times of Sclerotinia sclerotiorum or 50% methyl topiramate.
Soybean gray spot: also known as spot disease, generally began to occur in the first and middle of June, and entered the peak period in mid-July. The disease of pods began from the tender pod stage, the grain filling stage was the peak stage, and the disease was serious in high temperature and rainy years from July to August. Mainly harmful leaves, when the disease is serious, almost all leaves are covered with disease spots, resulting in premature shedding of leaves, a yield reduction of 20% to 30%, and a decline in quality. Chemical control: in addition to sowing seeds with 70% dimethazone wettable powder or 50% thiram wettable powder according to 0.3% of the seed amount, 40% carbendazim glue suspension 1.5 kg per hectare was sprayed with 450 kg water.
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Planting technique of 45 cm narrow row dense planting of soybean
The 45 cm narrow row dense planting cultivation technique of soybean is a new technology selected according to the climate, soil and cultivation characteristics of our region on the basis of the narrow row dense planting technology of soybean introduced from Heilongjiang in 2004 in Dunhua City. it is a new breakthrough in the reform of farming system in Dunhua City. Experiments were carried out in Guandi, Heishi and Shaheyan farms in 2005. the average yield of soybean in the experimental area was 202.9 kg per mu, an increase of 24.9% over the control. in 2006, the whole city popularized 1500 mu, with an average yield of 203.52 kg per mu, the highest.
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Main advantages of soybean "ridge three" cultivation technique?
The main advantages of soybean "ridge three" cultivation technology are as follows: 1. Soil subsoiling breaks the plough bottom layer, deepens the plough layer, improves the soil structure, is conducive to the development of soybean roots and the formation of nodules, subsoiling forms a soil structure with empty and empty coexistence, and improves the permeability of soil. Second, ridge body layer fertilization, improve the utilization rate of chemical fertilizer, and delay the fertilizer supply time, prevent the late stage of fertilizer loss. At present, the small-sized precision seeder applied in production can apply chemical fertilizer deeply, and can also apply seed fertilizer and base fertilizer simultaneously. Third, ridge soil double strip essence
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