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为了探讨在水旱轮作改土的基础上,改变肥料结构,提高土壤肥力的途径,在湖北咸宁横沟进行了两种轮作方式、三种肥料结构处理的田间试验。 一.试验设计 试验田长期(1965—1982年)实行肥稻稻连作制,土壤为第四纪红色粘土母质上发育的红壤性水稻土,土质粘重,土体滞水。土壤有机质含量较高,但缺磷少钾,植稻期耗用化肥胃口较大,但产量很低。试验田划分为三区,每区面积0.5亩,未设重复。 Ⅰ区采用绿肥、稻、稻—油菜、稻、稻—小麦、稻、稻的双三制,本田紫云英沤青以后,按照当地习惯只施氮、磷、钾化肥,以此作为对照处理。 Ⅱ区采用大豆、稻—油菜、稻、稻—蚕豆、稻、稻的水旱轮作制,本田作物残体、灶灰还田后,酌情减少化肥用量。 Ⅲ区是在Ⅱ区基础上加适量猪粪,进一步减少化肥用量。
In order to discuss the ways of changing the structure of fertilizers and improving soil fertility on the basis of crop rotation and soil rehabilitations, two field trials of crop rotation and three fertilizer treatments were carried out in the horizontal grooves of Xianning, Hubei Province. Experimental design Experimental field Long-term (1965-1982) The practice of paddy-rice continuous cropping system, the soil is Quaternary red clay parent material developed red paddy soil, soil sticky, soil water stagnation. Soil organic matter content is higher, but the lack of phosphorus and potassium, rice plant fertilizer consumption larger appetite, but the yield is very low. Experimental field is divided into three districts, each area of 0.5 acres, no duplication. In the area Ⅰ, only nitrogen, phosphorus and potassium fertilizers were applied according to the local habitat after using green manure, rice, rice-rape, rice, rice-wheat, rice and rice, . Area Ⅱ soybean, rice - rapeseed, rice, rice - broad beans, rice, paddy and drought rotation system, Honda crop residues, stove ash return, as appropriate, reduce the amount of fertilizer. Zone III is based on the area Ⅱ plus pig manure, to further reduce the amount of fertilizer.