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Relationship between grain crop yield potential and nitrogen response.

机译:粮食作物单产潜力与氮素响应之间的关系。

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The relationship between yield potential and N response in long-term cereal production is not well known. The objective of this study was to evaluate the relationship between yield potential (yield level) and N responsiveness in long-term winter wheat (Triticum aestivum L.) and maize (Zea mays L.) field experiments in Stillwater, OK (53 yr), Altus, OK (two trials, 45 yr each), Arlington, WI (49 yr), Shelton, NE (11 yr), Nashua, IA (32 yr), and Kanawha, IA (26 yr). Nitrogen responsiveness or the response index (RI) was determined by dividing the actual grain yield from high N rate plots by the yield from either the 0-N fertilizer check (RI 0-N) or medium N rate plots (RI mid-N). Linear relationships between maximum yield, RI 0-N, RI mid-N, and year were thus examined. For the seven long-term trials comprising 261 yr of site data, yield and N responsiveness were not related whether or not a medium N rate or the check plot (0-N) was used to determine RI. Because yield level and N responsiveness are independent, and both impact N demand, using both should assist in formulating more accurate fertilizer N recommendations.
机译:长期谷物生产中单产潜力和氮素响应之间的关系尚不清楚。这项研究的目的是评估在俄克拉荷马州斯蒂尔沃特市(53岁)进行的长期冬小麦(Triticum aestivum L.)和玉米(Zea mays L.)田间试验的产量潜力(产量水平)与氮素响应性之间的关系。 ,阿拉斯加州,俄克拉荷马州(两项试验,每项45年),威斯康星州阿灵顿(49岁),内布拉斯加州谢尔顿(11岁),爱荷华州纳舒厄(32岁)和爱荷华州卡纳瓦哈(26岁)。通过将高氮肥田的实际谷物产量除以0-N肥料检查(RI 0-N)或中氮肥田(RI中等N)的产量来确定氮素响应性或响应指数(RI) 。因此检查了最大产量,RI 0-N,RI中-N和年之间的线性关系。对于包含261年现场数据的七个长期试验,无论是否使用中等N比率或检查图(0-N)来确定RI,产量和N响应性均不相关。由于产量水平和氮素响应性是独立的,并且两者都会影响氮素需求,因此同时使用氮肥和氮素应有助于制定更准确的氮素建议。

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