PLACEMENT AND TIMING OF NITROGEN FERTILIZERS FOR CONVENTIONAL AND CONSERVATION TILLAGE CORN PRODUCTION

被引:15
作者
BUNDY, LG
ANDRASKI, TW
DANIEL, TC
机构
来源
JOURNAL OF PRODUCTION AGRICULTURE | 1992年 / 5卷 / 02期
关键词
D O I
10.2134/jpa1992.0214
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Increased use of reduced tillage to meet soil and water conservation goals in corn (Zea mays L.) production emphasizes the need to manage fertilizer N efficiently in these systems. A 3-yr study to evaluate N fertilizer source, placement, and timing options in four tillage systems was conducted on a Plano silt loam (fine-silty, mixed, mesic Typic Argiudoll) and a Manawa silty clay loam (fine, mixed, mesic Aquollic Hapludalf) using a split-split plot treatment arrangement with four replicates. Main plot treatments were moldboard plow (MP), chisel plow (CP), ridge-till (RT), and no-till (NT). Sub-plot treatments were rates of 90 and 180 lb N/acre, and sub-sub-plot treatments were seven N application methods (NAM). Grain yields in MP were higher than in NT on the Plano soil. Yields were significantly higher at the 180 lb N/acre rate than at 90 lb N/acre, and differed with NAM. Effects due to NAM were usually small (8-10 bu/acre), and similar, near-maximum yields were obtained with preemergence applied anhydrous NH3 with or without nitrapyrin [2-chloro-6-(trichloromethyl) pyridine], or N-Serve (N-S), surface broadcast urea-NH4NO3 solution (UAN), injected UAN with N-S, and with sidedress injected UAN without N-S. Results show that the NAM evaluated usually can be used across a range of tillage systems without major yield effects. Yields without added N were lower in NT than MP, suggesting lower soil N availability in NT. Ear leaf N concentration measurements did not always reflect small differences in yield caused by some N management practices.
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页码:214 / 221
页数:8
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