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通过研究，提出了关中灌区吨粮田土壤肥力指标及面积分布预估，得出一年两熟玉米和小麦的最佳施肥量分别为Ｎ１９４ ．７ ｋｇ／ｈｍ２ ，Ｐ２Ｏ５９０ ．６ ｋｇ／ｈｍ２ 和Ｎ１６２ ｋｇ／ｈｍ２ ，Ｐ２Ｏ５ １３２ ．７５ ｋｇ／ｈｍ２ ；玉米以马鞍式施肥增产显著；秸秆还田和年施有机肥５６．２５ ｔ／ｈｍ２ ，３ ａ 内可使土壤有机质相对增加１９ ．９７ ％ 和１８ ．１６ ％ ；优化栽培技术可以明显提高投肥效益
According to the research, the soil fertility index and the area distribution of the grain yield in Guanzhong Irrigation Area were put forward. The best fertilization amount of corn and wheat with double ripening in a year was N194. 7 kg / hm2, P2O590. 6 kg / hm2 and N162 kg / hm2, P2O5 132. 75 kg / hm2. The yield of maize with the saddle-type fertilization was significant. The amount of organic matter in the soil was increased by 56.25 t / hm2 after applying straw and organic fertilizer for 3 years. 97% and 18. 16%; optimization of cultivation techniques can significantly improve the efficiency of fertilizer