Cotton pre-sowing preparation and sowing techniques

Sowing is the basic link to win high quality and high efficiency of cotton. In order to guide the majority of cotton farmers to plant cotton scientifically, the following sowing techniques are put forward.

1. Select excellent cotton varieties.

Focus on the selection of early-maturing varieties. Such as the national trial of "Ji 668" and 99B and other excellent varieties. In order to preserve the seedlings, the germination test must be done before sowing and the suitable sowing amount must be determined. The sowing rate of machine sowing is about 2 kg / mu, and that of manual sowing on demand is about 1.5 kg / mu.

2. Adopt plastic film mulching technology.

Plastic film can increase temperature, preserve soil moisture and promote the early development of seedlings. The suitable sowing time of plastic film cotton is April 15-25; open-field cotton is usually sown after April 25 and ends around May Day.

3. Reasonable close planting

The principles to be mastered are: sparse planting in high water and fertilizer plots and close planting in dry and thin land. There are about 3500 seedlings per mu in medium fertility plots and about 4000 seedlings in dry and thin land. To take the size of the row planting form, wide row 80 cm, narrow row 50 cm.

4. Apply sufficient base fertilizer and re-apply flower and boll fertilizer

In order to achieve a yield of 250 per mu of seed cotton and 300 kg of seed cotton per mu, the plots with medium fertility should apply 20 kg of urea, 25 kg of diammonium and 20 kg of potassium sulfate at the bottom of each mu, and another 15 kg of urea should be applied at the flower and boll stage. Insect-resistant cotton is sensitive to organic fertilizer and potash fertilizer. If potassium fertilizer is insufficient, cotton red leaf stem blight and early senescence will occur, resulting in reduced yield.

5. Simplified cultivation techniques of "Ji 668" cotton seed in national examination.

It is suitable to simplify planting method for cotton fields with good water and fertilizer conditions and fertile soil, which can save labor and time. Two planting methods are usually adopted: large and small rows with a width of 1 meter, small rows with a width of 0.45 meters and a plant spacing of 1.2 meters, and equal row width of 1.2 meters and a plant spacing of 1 foot. If the mu density is about 1 800 trees per mu, if the mu density is about 1500 plants, all the leaf branches of cotton plants will be retained; if the mu density is about 1800 plants, 3 leaf branches will be retained. July 10-15 timely hit the top, hit the top to master 10 fruit branches. Timely chemical control according to the growth of cotton fields.