Key techniques of cotton sowing
Around April 20 is the golden season for cotton sowing all the year round. However, due to the late harvest of mustard this year, the harvest of mustard is closely related to the cotton sowing season, so the labor and time of cleaning up the mustard are tight. To this end, it is suggested that the vast number of cotton farmers should do a good job in the following aspects.
1. If, after the mustard harvest, it is already the cotton sowing season, and if you have to tidy up the mustard field or wait for the cotton to be sown for more than five days, you might as well seize the time to raise seedlings in a nutrition bowl after the mustard is harvested, so that it can not only save the seeds, but also protect the seedlings easily, and can also obtain early seedlings to compete for high yield.
2. Because the hybrid insect-resistant cotton seeds are more expensive, two days before sowing, the broken seeds and tender seeds should be picked out (centralized seedling should be fully utilized) and then sowed.
3. To apply seed fertilizer, 45% compound fertilizer per mu of cotton is applied within the width of plastic film before sowing. No matter it is drilling holes or opening ditches to sow, any fertilizer should not be close to the seeds, so as not to damage the buds and affect the emergence of seedlings.
4. According to the selection of planting density, the mu density of general hybrid insect-resistant cotton is 1300-1600 plants, the density of middle and late maturity varieties (such as "Xiangzamian 8") is thinner, and the density of early-onset varieties (such as "Nankang 3" and "Nankang 9") is higher.
5, the selection of plastic film, direct seeding cotton can be used plastic film width of 60-70 cm is the most appropriate, too narrow is not conducive to temperature increase early; too wide is not economical.
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Special circumstances encountered after cotton sowing
Treatment of several special cases of cotton after sowing 1. After sowing, soil moisture should be checked in time. For cotton fields with poor soil moisture and the possibility of drying out, ditches can be opened at the edge of the seed ditch to irrigate small water; cotton fields without water irrigation conditions can suppress and increase soil moisture before the seedlings are unearthed. 2. In case of rain after sowing, the ground is easy to harden and shell when it rains after sowing. After the rain, hoe and loosen the soil should be made in time to break the knot to help the seedlings to be unearthed. If the soil cover is too thick, you should pick the soil to save the seedlings; the seedlings can not stand the strong light of the sun, so you should pay attention when picking the seedlings.
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Extreme potassium deficiency in cotton fields will cause a large number of dead trees.
Cotton is sensitive to potassium deficiency, especially since the development of BT transgenic insect-resistant cotton, potassium-deficient cotton fields often show serious disease, premature senescence, few bolls, poor boll opening and poor fiber quality. Four or five years ago, the results of rapid measurement of available nutrients in cotton field soil in central and southern Hebei showed that the content of available potassium in most soil was less than 80PPM (mg / kg), which belonged to serious potassium deficiency, and some soils lacked 40PPM to the extent of extreme potassium deficiency. The data measured by the soil nutrient rapid measuring instrument are not accurate, and the content of available potassium in some soil samples is 0.
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