Spatial analysis of maize response to nitrogen fertilizer in Central New York

被引：28

作者：

Kahabka J.E. ^{[1
]}

Van Es H.M. ^{[1
]}

McClenahan E.J. ^{[1
]}

Cox W.J. ^{[1
]}

机构：

[1] Department of Crop and Soil Sciences, Cornell University, NY, USA

来源：

Precision Agriculture | 2004年 / 5卷 / 5期

关键词：

maize; nitrogen; site-specific management; variable-rate application;

D O I：

10.1007/s11119-004-5320-2

中图分类号：

学科分类号：

摘要：

An increasing number of farmers are considering the use of site-specific nitrogen (N) applications to maize (Zea mays L.) as a way of maximizing yield potential while minimizing fertilizer cost. The objectives of this 3-years experiment were to evaluate the spatial structure of yield response to N fertilizer and investigate the potential for site-specific N management under maize production in New York. Four experimental N rates (50, 110, 160, or 220 kg ha ∧1), two tillage systems (chisel till and zone-till) and two crop rotations (maize•maize and maize•soybean (Glycine max L.)) were superimposed over a 12 ha field in central New York State with a complex of Honeoye-Lima, Kendaia, and Lima soils ranging from moderately well to poorly drained soils. Pre-sidedress soil nitrate tests (PSNT) showed significant spatial structure but did not conform to that for crop N response, indicating that N fertilizer recommendations based on PSNT results cannot be simply applied in a site-specific management approach. Optimal N rate varied from 110 kg ha ∧1 for the dry years 1999 and 2000 to 220 kg ha ∧1 for 1998, with a warm wet spring. Tillage treatments were generally comparable in N response. Spatial yield response analysis showed limited field-scale regionalization of both yield and profit response to N, suggesting that site-specific application of nitrogen is impractical. The greatest source of variability in N requirements was observed with the annual effects of weather, and presents a greater potential for precise N application than site-specific application. Annual variations in optimum N rate were not related to annual yield differences and yield potential itself does not appear to be a good predictor of N needs.

引用

页码：463 / 476

页数：13

共 20 条

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