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Cotton micro-fertilizer technology
In the process of cotton growth, in addition to nitrogen, phosphorus, potassium and other elements as a nutritional supplement, but also inseparable from the role of trace elements, trace elements play an irreplaceable role in cotton growth and physiological metabolism. For example, zinc is an activator of enzymes and is involved in the biosynthesis of auxin; boron can promote other nutrients into cotton plants, promote root growth and flowering and fruiting. In actual production, cotton farmers have long focused on the application of nitrogen, phosphorus and potassium fertilizers, with little or no application of micro-fertilizers, resulting in the lack of trace elements in cotton fields, affecting the growth and yield of cotton plants. The following describes the application methods of zinc, boron and molybdenum micro-fertilizers, which can be selected according to local conditions.
1. Zinc Fertilizer Currently, the commercial zinc fertilizer has zinc sulfate and multi-effect zinc, and both zinc fertilizers can be used. The application method is preferably based on the application of the base, the amount of zinc sulfate is 1 kg to 1.5 kg, and the multi-effect zinc is 2 kg to 2.5 kg per mu. Before sowing, mix zinc sulphate or multi-effect zinc with other base fertilizers evenly, or mix well with a certain amount of soil, apply directly to the seedbed bauxite before cotton mashing, or mix well with Anjia fertilizer during cotton transplanting. Application to alleviate the deficiency of zinc in the soil during cotton growth. In the flowering and bolling stage of cotton, the zinc fertilizer can also be sprayed on the foliar surface to increase the peripheral peach, prolong the life of the functional leaf, increase the clothing score, increase the yield and improve the quality. Foliar spraying is generally carried out with 0.2% zinc sulphate solution and sprayed 2 to 3 times, each time 75 kg of fertilizer spray per acre.
Second, the basic fertilizer commodity boron mainly contains boric acid and borax, and most of the direct use in cotton production is borax. Borax is applied in many ways, and can be applied to the base, soaked, and used for root spray. Generally, the basic method is simple and labor-saving. Base application of 400 grams of borax per acre, applied with other base fertilizers before cotton tanning, or with ammeter fertilizer when transplanting cotton seedlings, or directly with other base fertilizers before sowing. Soak seeds with a concentration of 0.02% solution, soak seeds for 4 to 5 hours, pick up and dry and then sow. Spraying outside the roots, generally use a small amount of warm water to dissolve the borax and add cold water to a 0.2% solution, spray three times in the cotton bud stage, the initial flowering stage, and the full flowering stage, each time 75 kg of spray fertilizer per acre, spray boron Adding 0.5% urea is better.
Third, the molybdenum fertilizer commercial molybdenum fertilizer is mainly ammonium molybdate. The application method generally adopts external root spray fertilizer, sprayed with 0.1% ammonium molybdate solution in the seedling stage, bud period and flowering and bolling period, each time 50 kg of spray fertilizer per acre, 75 kg, can promote the cotton plant Growth and development.
When the micro-fertilizer is used for root-spraying, it should be sprayed before 9:00 am or after 5 pm on a sunny day to prolong the wet time of the fertilizer on the leaves, which is beneficial to the absorption of the leaves. To spray and spray evenly, pay special attention to the spraying on the back of cotton leaves to promote absorption and improve fertilizer efficiency. In order to save the process and exert the joint effect of various nutrients, the fertilizers used in the same period can be applied together according to the specific conditions, and the combination of pest control and pesticides can also be combined to make it "one spray and more effective". However, it should be noted that foliar spraying should not be mixed with alkaline pesticides. Phosphate fertilizer should not be mixed with zinc fertilizer, and grass ash should not be mixed with other alkaline foliar fertilizers.
Zinc and boron; although the amount of molybdenum fertilizer is small, its physiological effect and yield increase effect cannot be underestimated. In actual production and application, zinc, boron and molybdenum should be combined to fully exert the effect of micro-fertilizer on the high-yield cultivation of cotton.
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