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首页> 外文期刊>Soil Science Society of America Journal >Assessment of Soil Phosphorus and Potassium following Real Time Kinematic-Guided Broadcast and Deep-Band Placement in Strip-Till and No-Till
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Assessment of Soil Phosphorus and Potassium following Real Time Kinematic-Guided Broadcast and Deep-Band Placement in Strip-Till and No-Till

机译：运动引导和免耕深耕技术的实时运动引导广播和深频带定位后对土壤磷和钾的评估

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Fertilizer placement may cause non-uniform nutrient distribution in the soil, making it difficult to determine whole-field fertility by traditional sampling strategies. Our objectives were to determine P and K distribution after repeated applications in no-till and strip-till soils and to develop improved sampling procedures to estimate soil P and K levels on a corn (Zea mays L) and soybean [Glycine max (L.) Merr.] rotation with crops planted at 76-cm row spacing. Three trials near Pesotum, IL, received blends of 0-0, 22-42, 33-62, 44-83, 55-104, 66-125, and 77-145 kg P-K ha(-1) in fall 2007 and 2009 before corn planting. Applications were broadcast-applied in no-till (NTBC) and strip-till (STBC) and deep-banded in strip-till (STDB) 15 cm below the surface in the crop row OR) using real-time kinematic (RTK) satellite navigation. Every year soil P and K was measured at 10-cm increments to a 30-cm depth at 0, 19, 38, and 57 cm from the IR. Subsurface banding reduced P and K levels in the surface and increased them at the point of application, or deeper with the highest rate, while broadcast applications increased surface levels. Soil-surface K levels were greater at IR likely because of K leaching from senescing standing crops. Soil-test results indicated no need to adjust fertilizer rate based on tillage or fertilizer placement. A sampling ratio of 1:3 IR to between the crop rows (BR) seemed adequate to estimate soil fertility across a wide range of P- and K-fertilizer rates and soil test levels where the location of the fertilizer band or planting row is maintained constant.
机译：肥料的放置可能导致土壤中养分分布不均匀，从而难以通过传统的采样策略确定全田肥力。我们的目标是确定在免耕和剥离耕作土壤中重复施用后的磷和钾分布，并开发改进的采样程序来估算玉米（Zea mays L）和大豆[Glycine max（L. ）。以76厘米行距种植的农作物轮作。伊利诺伊州Pesotum附近的三项试验在2007年秋季和2009年接受了0-0、22-42、33-62、44-83、55-104、66-125和77-145 kg PK ha（-1）的混合饲料玉米播种前。使用实时运动（RTK）卫星将应用广播到免耕（NTBC）和剥离耕种（STBC）中，并在作物行表面以下15 cm的剥离耕种（STDB）中进行深层处理导航。每年，土壤P和K的测量距离IR分别为0、19、38和57 cm，以10 cm的增量递增至30 cm的深度。地下条带降低了表面的P和K含量，并在施用时增加了磷的含量，或者以最高的比率增加了其含量，而广播施用则增加了表面的含量。 IR引起的土壤表面钾水平较高，这可能是由于衰老的农作物中的K浸出所致。土壤测试结果表明无需根据耕作或肥料放置来调整肥料用量。作物行之间的IR比例为1：3，这似乎足以估计各种肥料和钾肥的施用率以及维持肥料带或种植行位置的土壤测试水平下的土壤肥力不变。

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