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对天津地区土壤养分含量与红小豆产量的相关关系的研究表明：在土壤速效磷含量＜ｌ０ｐｐｍ时，红小豆产量与土壤速效磷含量呈显著正相关。ｒ＝０．９８９，ｙ＝５３．１５＋６．９３ｘ。在天津地区土壤养分三要素中，影响红小豆产量的第１要素是土壤速效磷，第２要素是碱解氮，第３要素是速效钾。在土壤碱解氨≥８０ｐｐｍ、速效磷≥２４ｐｐｍ、速效钾≥ｌｌ５ｐｐｍ时，无需施肥
The study on the relationship between soil nutrient content and yield of adzuki bean in Tianjin showed that there was a significant positive correlation between the yield of adzuki bean and the content of available phosphorus in soil when available phosphorus content was less than 10ppm. r = 0.989, y = 53.15 + 6.93x. Among the three elements of soil nutrients in Tianjin, the first element that affects the yield of adzuki bean is soil available phosphorus, the second element is alkaline hydrolysis nitrogen and the third element is available potassium. In the soil alkaline hydrolysis ammonia ≥ 80ppm, available phosphorus ≥ 24ppm, available potassium ≥ 111ppm, without fertilization