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阐明保持一定产量的土壤营养状况的最适参数,对于按计划产量确定施肥量,十分重要。在北高加索广大的灌溉农业区,土壤缺磷常常影响着作物产量的提高。那里65%的耕地速效磷含量低,该地区分布最广的土壤(前高加索碳酸盐黑钙土)最缺磷。但是,对作物产量的高低与土壤速效磷含量水平之间数量的数学表达关系的研究尚还不足,用此急需确定为保证碳酸盐黑钙土地带
It is important to clarify the most appropriate parameters for soil nutrient status to maintain a certain yield for determining the amount of fertilizer applied on a planned basis. Phosphorus deficiency in soils often affects crop yields in the vast Northern Irish irrigated agricultural areas. Where 65% of the arable land is low available phosphorus, the most widely distributed soil in the area (formerly Caucasus Carbonate Chernozem) is most deficient in phosphorus. However, there is still not enough research on the relationship between the quantity of crop yield and the quantity of soil available phosphorus, which is urgently needed to ensure that the carbonate calcareous soil zone