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首页> 外文期刊>Australian Journal of Crop Science >Decreased potassium fertilization in sugarcane ratoons grown under straw in different soils
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Decreased potassium fertilization in sugarcane ratoons grown under straw in different soils

机译：秸秆还田在不同土壤条件下种植甘蔗再生区的钾肥减少

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The presence of straw from sugarcane (Saccharum ssp.) left on the soil surface after mechanical harvest has contributed to increase productivity of this crop and reduce potassium fertilization due to release of this nutrient and increased soil organic matter. Thus, the present study sought to evaluate the response of the second sugarcane ratoon cultivated under sugarcane straw resulting from harvest of the first ratoon, in function of potassium doses, in dystrophic Red Yellow Latosol (dRYL) and eutrophic Red Yellow Agirsol (eRYA). For this, two field experiments were conducted for the second sugarcane ratoon grown in the conservation system, where one experiment was developed in dRYL (variety SP81-3250) and the other in eRYA (variety RB855453). The treatments in both soil consisted of doses of 32.5, 65.0, 130.0 and 195.0 kg ha-1 of K2O in the form of potassium chloride, and a control treatment, arranged in a randomized block design with five repetitions. Potassium fertilizer was applied alongside the row of ratoons, without incorporation. We evaluated the biometric variables (height, tiller number and diameter), potassium contents in the soil, leaf and straw, K accumulation in the straw, stalk and shoot, production of straw and stalks, and technological quality. Potassium doses resulted in a productivity increase of about 75 and 22 Mg ha-1 in the dRYL and eRYA, respectively. The dose of 65 kg ha-1 of K2O, corresponding to 50% of the recommended dose for the conventional crop, promoted the acquisition of 88 and 95% of the maximum sugarcane crop yield in dRYL and eRYA, respectively. Potassium fertilization increases production and accumulation of this nutrient in sugarcane straw, potentially benefiting the upcoming crops.
机译：机械收割后残留在土壤表面的甘蔗（Saccharum ssp。）秸秆的存在有助于提高该作物的生产力，并由于释放这种养分和增加土壤有机质而减少钾肥。因此，本研究试图评估营养不良的红黄色Latosol（dRYL）和富营养性的红色黄色Agirsol（eRYA）对甘蔗秸秆下耕种的第二个甘蔗再生棉的响应，该响应与钾剂量的函数有关。为此，对在保护系统中生长的第二个甘蔗再生区进行了两次田间试验，其中一项试验在dRYL（品种SP81-3250）中进行，另一项试验在eRYA（品种RB855453）中进行。在两种土壤中的处理均包括以钾盐形式的32.5、65.0、130.0和195.0 kg ha-1的K2O剂量，以及对照处理，以随机区组设计进行，重复五次。钾肥在不合并的情况下与一排再生肥一起施用。我们评估了生物特征变量（高度，分till数和直径），土壤，叶片和稻草中的钾含量，稻草，秸秆和芽中的钾积累，稻草和秸秆的生产以及技术质量。钾剂量导致dRYL和eRYA的生产率分别提高了约75和22 Mg ha-1。 65 kg ha-1的K2O剂量相当于常规作物推荐剂量的50％，分别促进了dRYL和eRYA中甘蔗作物最大产量的88％和95％的获得。施钾增加了甘蔗秸秆中这种养分的生产和积累，可能使即将到来的作物受益。

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