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首页> 外文期刊>Agronomy Journal >Maximum rates of seed placed fertilizer for corn for three soils.
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Maximum rates of seed placed fertilizer for corn for three soils.

机译：三种土壤的玉米播种肥料最大施肥量。

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Fertilizer is placed in the seed row with corn (Zea mays L.) to increase plant growth. Fertilizers contain salts that have the potential for damaging roots and reducing plant emergence. The objective of this study was to determine the rates of fertilizer sources that can safely be placed with the corn seed for three soils with differing chemical properties. Eleven liquid and dry fertilizer sources were tested at five rates in the greenhouse on three soils: clay loam (CL), fine sand (FS), and silt loam (SiL). After 14 d of plant growth, final stand counts and plant mass were used to develop damage index values using the mean and product of relative plant emergence and plant mass. Predicted rates indicated that 10.6 kg N+K ha-1 could be applied for CL and SiL soils while the rate was 5.7 kg for the FS. Predicted rates using total N plus K agreed with rates predicted when using the salt index of the fertilizer times the rate applied except for ammonium thiosulfate (ATS) and a low-salt N-P-K fertilizer source. Better predictions were made when N and S were considered for ATS and only N for the low-salt fertilizer. Both models predicted rates similarly for the FS, but the N plus K model was more conservative for the CL and SiL soils. The data indicate that a single model could be used for predicting seed-safe rates for multiple fertilizer sources; however, care must be taken because predicted rates may assume optimal soil moisture.
机译：将肥料与玉米（Zea mays L.）一起放在种子行中，以增加植物的生长。肥料中含有可能破坏根部和减少植物出苗的盐。这项研究的目的是确定三种化学性质不同的土壤可以安全地与玉米种子一起放置的肥料来源的比率。在温室中以五种速率在三种土壤上测试了11种液体肥料和干燥肥料的来源：粘土壤土（CL），细沙（FS）和粉壤土（SiL）。植物生长14天后，使用相对植物出苗率和植物质量的平均值和乘积，使用最终林分数和植物质量来得出伤害指数值。预测的施用量表明，CL和SiL土壤可施用10.6 kg N + K ha -1 ，而FS施用5.7 kg。使用总氮+钾的预测比率与使用肥料的盐指数乘以施用的比率（除硫代硫酸铵（ATS）和低盐N-P-K肥料来源）所预测的比率一致。当对ATS考虑N和S而对低盐肥料仅考虑N时，可以做出更好的预测。两种模型对FS的预测速率相似，但对于CL和SiL土壤，N + K模型更为保守。数据表明，可以使用单一模型来预测多种肥料来源的种子安全率;但是，必须小心，因为预测的速率可能会假设土壤湿度最佳。

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