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1.在我省川水地区,土壤肥力中偏低的条件下,选用半矮秆分蘖力强的小麦品种,每亩播量35万粒,保苗25—30万,优质有机肥料5000斤、纯 N 25—30斤,P_2O_5 12—16斤,结合良好的栽培措施,就能满足千斤以上小麦对氮、磷肥料的要求。在此生产水平条件下,过多施用氮磷化肥无明显增产效果。2.每亩氮素用量20斤的处理,氮、磷比以1:1的较好;氮素用量30斤的处理,氮、磷比以1:0.5的较好。3.土壤中有效磷含量在20ppm 以上时,要获得小麦高产,施用磷肥,增产效果仍很显著。4.由于土壤中全钾和速效性钾都很丰富,在千斤高产条件下,仍能满足小麦需要,不再需要施用钾素化肥。
1. In Sichuan Province, Sichuan Province, low soil fertility conditions, the selection of semi-dwarfing strong tillering wheat varieties, sowing 350,000 acres, Paul seedling 25-30 million, high-quality organic fertilizer 5000 pounds, pure N 25-30 pounds, P_2O_5 12-16 pounds, combined with good cultivation practices, will be able to meet the above pounds wheat nitrogen, phosphorus fertilizer requirements. Under the condition of this level of production, excessive application of N and P fertilizers did not produce significant increase in yield. The amount of nitrogen per acre 20 kg treatment, nitrogen, phosphorus ratio of 1: 1 better; nitrogen dosage of 30 kg of treatment, nitrogen, phosphorus ratio of 1: 0.5 is better. Soil available phosphorus content of 20ppm or more, to get high yield wheat, the application of phosphate fertilizer, increase yield is still significant. 4. Because the soil potassium and available potassium are very rich, under the condition of high yield, can still meet the needs of wheat, no longer need to apply potassium fertilizer.