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首页> 外文会议>Beltwide Cotton Conferences >RESIDUAL SOIL NITROGEN EVALUATIONS IN IRRIGATED SOILS OF THE DESERT SOUTHWEST
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RESIDUAL SOIL NITROGEN EVALUATIONS IN IRRIGATED SOILS OF THE DESERT SOUTHWEST

机译：西南沙漠灌溉土壤中的残余土壤氮素评价

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A series of studies were conducted in the central region of Arizona from 2001 through 2004 to examine the effects of residual fertilizer nitrogen (N) on plant growth and development, yield, fiber quality, and soil NO_3~- -N levels. Residual N projectswere initiated at the University of Arizona Maricopa (MAC) and Marana (MAR) Agricultural Centers in 2001 following 10 (1991-2000) and 7 (1994-2000) years at Maricopa and Marana respectively of N management studies involving a control and three differentN management regimes. Soil NO_3~--N levels in all four treatments at both locations declined dramatically, particularly in the 0-30cm level after 2001 with the cessation of fertilizer N applications. Soil NO_3~--N levels have approached a steady level of less than 5 parts per million (ppm) in all treatments at both locations. Lint yield response differed at the two locations. Lint yield at MAC fell precipitously over the course of the four-year residual N project. Lint yield levels averaged near 1500 kg ha~(-1) at the initiation of the residual study. After four years of no fertilizer N applied lint yields had fallen to 900 kg ha~(-1). Lint yields at MAR however, have remained higher. At the initiation of the residual study lint yield levels were near 1200 kg ha~(-1). After four years of no fertilizer N applied lint yields still have remained near 1200 kg ha~(-1).
机译：从2001年至2004年在亚利桑那州中部地区进行了一系列研究，以研究残留肥料氮（N）对植物生长和发育，产量，纤维质量和土壤NO_3〜 - -N级别的影响。在亚利桑那州Maricopa（MAC）和马拉纳（MAR）农业中心的剩余N项目在2001年在MariCopa和Marana的7（1994-2000）年的2001年在涉及控制和的N管理研究三个不同的管理制度。两种地方的所有四个治疗中的土壤NO_3〜 - C水平显着下降，特别是在2001年后的0-30厘米水平，随着肥料N应用的停止。在两个地点的所有治疗中，土壤NO_3〜-N水平在所有治疗中都接近百万分之一的稳定水平少于5份（ppm）。棉绒收益响应在两个位置不同。在四年的残差N项目的过程中，Mac的棉绒产量落下。在残留研究的开始时，棉绒产量水平平均接近1500千克〜（-1）。四年后没有施肥液，棉绒产率下降至900千克〜（-1）。然而，3月份的棉绒产量保持更高。在剩余研究的开始时，棉绒产率水平接近1200kg ha〜（-1）。经过四年的肥料N施用棉绒收益率仍然保持在1200千克HA〜（-1）附近。

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