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首页> 外文期刊>Agronomy Journal >Effect of tillage and nitrogen rate on corn yield and nitrogen and phosphorus uptake in a corn-soybean rotation.
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Effect of tillage and nitrogen rate on corn yield and nitrogen and phosphorus uptake in a corn-soybean rotation.

机译：玉米-大豆轮作中耕作和施氮量对玉米产量和氮磷吸收的影响。

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摘要

Understanding tillage, N, and P interactions can contribute to improved N and P utilization and crop response. This study examined the interaction effects of tillage and N rate of two N sources on N and P uptake by corn (Zea mays L.). The study was conducted on Kenyon loam (fine loamy, mixed, mesic Typic Hapludolls) soil at the Iowa State University Northeast Research and Demonstration Farm near Nashua, IA. A randomized complete block design with a split-plot arrangement in three replications was used for the two separate N source experiments. The tillage systems consist of no-tillage (NT), strip-tillage (ST), and chisel plow (CP) as main plots. Within each tillage four N rates (0, 85, 170, and 250 kg N ha-1) were assigned as subplots for each N source of manure (total N) and fertilizer (anhydrous ammonia) in a corn-soybean [Glycine max (L.) Merr.] rotation. Tillage and increase in N rate beyond 85 kg ha-1 had no effect on corn grain yield with both N sources. Tillage x N rate had a significant effect on plant N and P uptake, especially at early growth stages with both N sources. Recovery percentage of applied N across all tillage systems and N rates was 40% and 27% for manure and fertilizer sources, respectively, at the 12th-leaf growth stage of corn (V12). Plant N and P uptake at V12 growth stage was 44% and 37%, respectively, across tillage systems, N sources, and N rates. The findings indicate that the N rate and seasonal variability have more influence on plant N and P uptake than does the tillage system.
机译：了解耕作，氮素和磷素的相互作用可有助于提高氮素和磷素的利用率以及农作物的响应。这项研究研究了耕作和两种氮源的氮素比率对玉米（玉米（Zea mays L.））吸收氮磷的影响。这项研究是在爱荷华州爱荷华州立大学东北研究与示范农场附近的Kenyon壤土（细质壤土，混合的，典型的Typic Hapludolls）上进行的。在两个单独的N个源实验中，采用了具有重复绘制图的三份重复的随机完整块设计。耕作系统由免耕（NT），剥离耕种（ST）和凿犁（CP）为主。在每个耕作中，将玉米-大豆中每种氮肥（总氮）和肥料（无水氨）的四个氮素含量（0、85、170和250 kg N ha-1）分配为子图。 L.）Merr。]旋转。两种氮源的耕作和氮肥含量超过85 kg ha-1的增加均对玉米籽粒产量没有影响。耕作×施氮量对植物氮和磷的吸收有显着影响，特别是在两个氮源均处于生长早期的情况下。在玉米（V12）的第12生育期，在所有耕作系统中施用的氮的回收率分别为肥料和肥料来源的N的比例分别为40％和27％。在整个耕作系统，氮源和氮肥比率下，V12生长阶段植物的氮和磷吸收量分别为44％和37％。研究结果表明，氮素含量和季节变化比耕作制度对植物氮素和磷吸收的影响更大。

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