Cotton Planting Knowledge (Seven) Cotton Fertilization

< p > < a href= "http://www.91se91.com/news/" > basal fertilizer > /a >.

Organic fertilizer is the main base fertilizer, and it is generally used as fertilizer for manure, manure, compost, green manure, river mud and grass pond sludge.

Their nutrient contents and their absorptive and utilization rates were not the same. The absorption and utilization rate generally accounted for about 30% of the total nutrient content of the basal fertilizer. Therefore, the amount needed for the base fertilizer application must be more.

There are many kinds of farmyard manure for cotton basal fertilizer, and their fertilizer efficiency varies. Cotton compost or soil manure is used as base fertilizer in cotton field of the Yellow River River Basin.

Because of the lower fertilizer efficiency of basic fertilizer, the average cotton field is more than 30000 kilograms per hectare. In the cotton field of the Yellow River River Basin, the fertilizer is applied to the field before the winter tillage, or the ditch is applied in a centralized way, and then ploughed into the soil, so as to decompose the fertilizer and decompose.

If the fertilizer is not enough, when winter ploughing is not applied, it is necessary to make early ploughing as early as possible in spring.

The wheat and cotton intercropping two cotton intercropping system is better to apply basal fertilizer before jointing wheat, because at this time wheat seedlings are still small, the furrow can be used to dig furrows between rows, which can ensure the quality of fertilization, and will not damage wheat seedlings and wheat roots.

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< p > some cotton fields are deficient in phosphorus and potassium, which can increase phosphorus and potassium fertilizer as basal fertilizer, which is conducive to the absorption and utilization of deep roots.

Summarizing the experience of other regions, the average soil fertility of cotton fields is about 50% ~ 60% of the total amount of nitrogen fertilizer.

In the dry land cotton fields in the north, where the organic fertilizer sources are scarce, the use of ammonium bicarbonate as the base fertilizer has been greatly promoted in recent years, which greatly improved the utilization ratio of ammonium bicarbonate and produced remarkable results.

The use of cake fertilizer as the base fertilizer for cotton fields, especially in areas where organic fertilizer sources are scarce, should be vigorously promoted.

The cake fertilizer is applied to the field as the base fertilizer, which is generally 750 kg per hectare.

Based on phosphate fertilizer, the application of SSP is generally 300~350 kg per hectare, and potassium fertilizer or potassium chloride is applied to basic potash fertilizer, generally 150~225 kg per hectare.

The advantage of chemical fertilizer as base fertilizer is to make the base fertilizer of cotton field develop from single organic fertilizer to organic fertilizer combined with inorganic fertilizer, and combine with slow acting fertilizer and quick acting fertilizer. It can not only supplement the supplying ability of soil in seedling stage, but also continuously supply the needs of cotton production.

Base fertilizer can also play a role in replacing fertilizer, and it is safer and more effective than applying fertilizer.

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< p > top dressing.

After a href= "http://www.91se91.com/news/index_c.asp" > cotton basal fertilizer > /a > and topdressing application, in order to meet the needs of cotton in different growth stages, we need to apply fertilizer by stages.

Generally, topdressing nitrogen fertilizer is the main method. The number of topdressing nitrogen fertilizer accounts for about 40% to 50% of the total fertilizer application.

In the different growth stages, we should master the principle of "light, stable, heavy and complementary" in the amount of application. That is to say, during the seedling stage and bud stage of cotton, the fertilizer application should be light and stable.

In the middle or middle grade cotton fields, the average number of top dressing was 2~3 times, mainly in bud stage and flowering stage.

In order to avoid wasting fertilizer and increasing input, it is easy to cause the cotton to grow vigorously.

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< p > cotton after topping < a href= "http://www.91se91.com" > fertilizer technology < /a > /p >

< p > cotton topping is the most intense competition for nutrients in all organs. The development of young bolls needs nutrients after flowering. The increase and flowering of buds need nutrients. Kobe Kaji's elongation and the emergence of new leaves and buds need nutrients. If the nutrient supply is insufficient, it is not the lower part of the bell that decreases, that is, no boll at the top, or the premature decay of leaves, the abscission of leaves and the reduction of boll weight after Bolling.

In addition, the combination of Rhizosphere Fertilization and foliar spraying should be applied in time, supplemented with nitrogen and potassium fertilizers, while phosphorus deficient soil should be supplemented with phosphate fertilizer.

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< p > it should be noted that combined with foliar fertilizer, adding proper amount of cotton into the 15 kg liquid can increase the nutrient delivery volume, increase the volume of nutrient pportation, increase the vigor and resistance of cotton bolls, speed up the emergence of cotton trees, circulate the loquat, and improve the fiber quality.

At the same time, the efficiency of all kinds of pesticides and foliage fertilizer could be increased by 30%.

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