Cotton Fertilization Problems and Fertilization Principles
The main cotton planting area of ​​Suixian County is Hetuo and hilly land. There are mainly N and P fertilizers used in the fertilization of cotton, the organic fertilizer is insufficiently used, the amount of potash fertilizer in the Hefei Land is insufficient, the amount of trace fertilizer is small or unused, and the fertilization time is not appropriate. Foliar spray fertilizer is not popular and other issues, in view of the above situation, the following special fertilization principles are proposed.
1. Add organic fertilizer, cover the field with straw (grass straw, rapeseed rod shell, rice straw), preserve fertilizer, suppress weeds, and promote the combination of organic and inorganic fertilizers.
2. According to the fertility of cotton fields, adopt the principle of reducing nitrogen, stabilizing phosphorus and increasing potassium.
3. Boron and zinc fertilizers in soils with obvious boron and zinc deficiency in soil should be based on boron and zinc fertilizers. The potential deficiency should focus on foliar spraying of boron and zinc fertilizers, or the combination of basic application and foliar spraying.
4. The principle of concentrated application of fertilizers in the form of acupuncture points or strips, depths, etc.
5, fertilization should be combined with high yield, high quality and efficient cultivation techniques.
Fertilization advice
1. Total amount of fertilization: The yield per hectare of the lint is about 90-100 kilograms. The total amount of fertilization is: about 2000 kilograms of high-quality organic manure, 16-18 kilograms of nitrogen fertilizer (pure nitrogen), and phosphorus (phosphorus pentoxide) 4- 6 kg, potassium fertilizer (pure potassium oxide) 8-10 kg, supplement borax 0.5-1 kg/mu and zinc sulfate 1.5 kg/mu.
2. Fertilizer selection: Apply single fertilizer, urea (46%) for nitrogen fertilizer, calcium (12%) for phosphate fertilizer, and potassium chloride (60%) for potassium; actively promote nitrogen-phosphorus-potassium formula 16-5-9 ,15-7-8,20-8-12,22-8-15 and other similar formula fertilizer based.
3. Application methods: 30% of nitrogen fertilizer is used as base fertilizer, 25% is used as top-dressing fertilizer, 25% is used as topdressing fertilizer, and 20% is used as top-dressing fertilizer; phosphate fertilizer, boron fertilizer, and zinc sulfate are all used as basic facilities; 50% of potash fertilizer is used as base fertilizer, and 50% is used as top dressing fertilizer. From the flowering stage on the growing weak cotton field, spray 0.5% urea and 0.5% potassium dihydrogen phosphate solution 50-75 kg / time, spray once every 7-10 days, continuous spraying 2-3 times.
Corn is a good choice for consumption during weight loss because of its high available energy. The metabolic energy of maize is 14.06 MJ/kg, with the highest being 15.06 MJ/kg, the highest of the cereal feeds. This is mainly due to the fact that there is very little crude fibre in maize, only 2%, while the nitrogen-free leachate is up to 72% and the digestibility is up to 90%; on the one hand, maize has a high crude fat content, between 3.5% and 4.5%.
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