Rotten peaches are taboos for cotton production. It has been painful to have matured bolls that have become rotten.
The degree of rotten peaches varies greatly among farmers and different fields. The weather is often the inducement factor of cotton rotten fruit, especially from August to September, when the temperature is 25°C~32°C and the relative humidity is about 80%, the duration will be more than one week, rotten peaches will be concentrated and contiguous.
In terms of the occurrence of rotten peaches, the lower part of the cotton plant has 1 to 5 layers of fruit rot and more rotten peaches. The upper middle and lower fruit rots are less rotten, and the inner rot is much worse, and the outer rot is less.
From the analysis of the causes of rotten peaches, except for the induction of climatic factors, there are some obvious deficiencies in cotton cultivation techniques: First, the selected cotton varieties have lower peaches or more vegetative branches, and rotten peaches often bear the brunt; The input of fertilizers has been increasing year by year. In particular, the application of nitrogen fertilizers has been on the rise, leading to strong nutrient growth in cotton, increased leaf area coefficient, severe shading in cotton fields, lack of light, high humidity, and deterioration of the ecological environment for cotton survival. Fertilizer factors will increase. The main contradiction rose to rotten bells; the third is that the chemical control was not matched in time, resulting in the imbalance of vegetative growth and reproductive growth of the cotton plants, which led to the emergence of axillary buds or "secondary growth", further exacerbating the shading of cotton fields; Fourth, the planting methods were unreasonable The narrow row spacing of cotton is too early to seal the line and it is difficult for the fields to be airy and light-transmitting. Fifth, pest control is not complete, and bolls are damaged by insects, and the bacteria can easily invade.
Prevention measures for bar peaches are:
First, choose the right road variety. Should choose medium-maturing or late-maturing, the first fruit-tree with higher-ranking varieties, and good varieties with good resistance to rotten peaches. Don't blindly sow seedlings earlier, generally planting seeds in mid-April.
Second, improve the structure of investment. In order to fully display the advantages of the excellent cotton varieties, one must reduce the total amount of fertilizer in the cotton field, control the fertilizer input per mu within 300 yuan, and secondly, prevent the partial application of nitrogen fertilizer; third, increase the application of bio-organic compound fertilizer and high content of potassium fertilizer. Fourth, it is necessary to chemically regulate and shape the shape of a good cotton plant.
Third, the expansion increases lighting. For hybrid cotton, it is very important to increase the row spacing. Generally, the row spacing is from 1 to 1.2 meters and the plant spacing is from 0.4 to 0.5 meters. The density per hectare is relatively moderate from 1300 to 1500, ensuring the ventilation of the cotton fields.
Fourth, prevent and control pests. For the fourth generation of the bollworm and the second and third generations of crossing the red bollworm and the third generation of red bollworm and beet armyworm, etc., should be sprayed in time to prevent the boll on the boll rotten peach. For the middle and lower bolls, spray 1 to 2 times of 25% carbendazim 500 times, or 50% thiophanate 1000 times. At the same time, rush to pick up the critical peach.
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