1.FertilizingPrinciples
For the southern autumn winterPotatoesDuring plantingOrganic fertilizerAndPotassium fatThe following principles of fertilization are proposed, among others, for under-use:
(1) rational regulation of nitrogen, phosphorus and potassium fertilizer, based on soil survey results and target production, with reference to the national nitro fertilizer quantification rate (preliminary) for potato-producing areas, to optimize the use of nitrogen phosphorus potassium fertilizer according to soil fertility conditions。
(2) organic inorganic application, increased application of organic fertilizers, promotion of straw cover; prohibition of the use of fully decomposed organic fertilizers。
(3) appropriately increased potassium fertilizer。
(4) a combination of base fat, pursuit of fatty, which is dominated by potassium nitrogen。
(5) fertilizer application is combined with green efficiency growth techniques。
2. Fertilization recommendations
(1) production levels above 3,000 kg/acre, nitrogen fertilizer (n) 11-14 kg/acre, phosphorous fertilizer (p2o5) 10-12 kg/acre, potassium fertilizer (k2o) 12-15 kg/acre。
(2) production levels of 2000-3000 kg/acre, nitrogen fertilizer (n) 9-11 kg/acre, phosphorous fertilizer (p2o5) 7-9 kg/acre, potassium fertilizer (k2o) 10-12 kg/acre。
(3) production levels of 1500-2000 kg/acre, nitrogen fertilizer (n) 7-9 kg/acre, phosphorous fertilizer (p2o5) 5-7 kg/acre, potassium fertilizer (k2o) 7-10 kg/acre。
(4) production levels below 1,500 kg/acre, nitrogen fertilizer (n) 6-7 kg/acre, phosphorous fertilizer (p2o5) 3-5 kg/acre, potassium fertilizer (k2o) 5-7 kg/acre。
(5) 13-15-17 (n-p2o5-k2o) or equivalent formulations are recommended for application as base fertilizer at 40-50 kg/acre. The choice of urea and potassium sulphate (or composite fertilizer of potassium nitrogen) for fertilisation may also be 15-5-20 or the formulation of a similar formulation。
(6) application of 2 to 3 formulas of decomposed farm-based fertilizer per acre, or of 200 to 400 kg of organic fertilizer per acre; application of organic fertilizer by fertilizer can reduce the use of fertilizers by 15 to 20 per cent, as appropriate; nitrogen potassium fertilizer by 40 to 50 per cent is used as fertilizer, 50 to 60 per cent is used as fertilizer, and all phosphorus fertilizer is used as fertilizer, which should be used in sub-divisions for soil-based sanded fields; in soil lacking in beryllium or zinc, it can be applied by 1 to 2 kg/acre or zinc sulphate; acid soils or soil lacking effective calcium or magnes, with an appropriate increase in the input。
(7) the application of organic and phosphorous fertilizers can be increased appropriately in winter with low temperatures。
