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在美国东南部滨海平原的砂土表层,有效SO_4~(2-)的含量很低。作物经常依靠吹收B层的SO_4~(2-)来维持生长。本研究的目的是为了测定在三种土壤上的冬小麦(Triticum—aestivum L)对硫肥的反应。这三种土壤其B层的深度各不相同,沃哥瑞姆(Wag—ram)土壤(砂质残存湿老土)B层深度大于50厘米,两种诺福克(Norfolk)土壤(典型残存湿老土)B层深度分别为31和48厘米,硫素肥料施用量范围是0～90公斤/公顷。硫素的来源是Caso_4·2H_2O,元素硫正膨润土(Sol—u—Sul)和(NH_4)_2So_4。测定项目是植株体内的硫浓度和N/S比率及抽穗时根的分布深度和收获时的谷物产量。产量对硫肥的反应获得于沃哥瑞姆土壤和诺福克土壤上。在这种土壤上根系的生长受到了犁底层的限制,所以在B层为31厘米的诺福克土壤上没有产量。在二月来,以So_4~(2-) 为硫源,施用量为20公斤/公顷的处理最能充分反应。而在二月份以Sol—u—Sol为硫源的硫肥没有效果。硫酸铵与CaSo_4效果相同。在没有施肥的植株中,S的浓度为0.6克/公斤干重,N/S为21。小麦对硫肥的反应取决于B层的深度和根系在土壤剖面中的分布。根系分布在30～40厘米深的诺福克土壤上,硫肥没有作用。这个深度包括了SO_4~(2-)的积累。在诺福克土壤中30厘米的地方,根系生长受到抑制,而且在这种土壤上SO_4~(2-)的积累开始于45厘米深处,因此它对硫的反应最强烈。
In the sand surface of the coastal plain in the southeastern United States, the available SO 4 4- (2-) content is very low. Crops often rely on the blowing layer B SO_4 ~ (2-) to maintain growth. The purpose of this study was to determine the response of sulfur fertilizer to winter wheat (Triticum-aestivum L) on three soils. The three soils have different depths of layer B, with layer B depths greater than 50 cm for Wag-ram soil (sandy residual wet-weathered soils), two Norfolk soils Wet old soil) B depth of 31 and 48 cm respectively, sulfur fertilizer application range of 0 ~ 90 kg / ha. The sources of sulfur are Caso_4 · 2H_2O, Sol-u-Sul and (NH_4) _2So_4. The measurement items are the sulfur concentration and the N / S ratio in the plant body and the depth of root distribution at heading and the grain yield at harvest. Yield response to sulfur fertilizers was obtained on Vogor and Norfolk soils. The growth of the root system on this soil is limited by the plow floor, so there is no yield on Norfolk soils up to 31 cm in layer B. In February, the treatment with SO_4 ~ (2-) as the sulfur source and the application rate of 20 kg / ha can most fully react. In February, sulfur fertilizers derived from Sol-u-Sol were not effective. Ammonium sulfate has the same effect as CaSo_4. In non-fertilized plants, the concentration of S was 0.6 g / kg dry weight with a N / S of 21. The response of wheat to sulfur fertilizer depends on the depth of layer B and the distribution of the root system in the soil profile. Roots distributed in 30 to 40 cm deep in Norfolk soil, sulfur fertilizer has no effect. This depth includes the accumulation of SO_4 ~ (2-). Root growth was inhibited 30 cm in Norfolk soils, and SO 4 2- accumulation in this soil began at 45 cm deep, so it reacted most strongly to sulfur.