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1.在红壤上,氮磷配合施用,其曲线型保持原土的特征,超粘限曲线在减方0.1N处凹折,单施氮肥,曲线型的变化较大,在碱方0.1N处的凹折均已消失;单施磷肥,超粘限曲线在酸方大大降落于粘限曲线之下,韧限曲线也降低。磷和氮单独施用,都不表现原土曲线的特征。紫色土的不同肥料处理,各组曲线间的变化均比较小,大部分维持原土的特征。 2.土壤的宜肥种类可以通过粘韧曲线型的特征来判断。施入的肥料能维持原土的胶体活性者才能增产,扰乱原土的胶体活性者,不但影响产量的提高,反而使土壤的物理性质变坏、渗透压提高,导致一系列不良后果。 3.用粘韧曲线法判断土壤的宜肥问题比一般化学分析法省时间,并可得到良好的结果。
In the red soil, the application of nitrogen and phosphorus, the curve to maintain the characteristics of the original soil, hyperbolic limit curve in the reduction of 0.1N concave concave, single nitrogen fertilizer, the curve of the larger changes in the alkaline 0.1N Of the kinks have disappeared; phosphate alone, over-viscosity curve in the acid side greatly falls below the viscosity limit curve, the toughness curve is also reduced. Phosphorus and nitrogen alone, do not show the characteristics of native soil curve. Purple soil of different fertilizer treatment, changes in the curve between the groups are relatively small, most of the original soil to maintain the characteristics. Soil fertility types can be judged by sticky-toughness curve characteristics. The applied fertilizers can maintain the colloid activity of the original soil to increase the yield. Disrupting the colloidal activity of the original soil not only affects the increase of yield, but also deteriorates the physical properties of the soil and increases the osmotic pressure, resulting in a series of adverse consequences. 3. Sticky-toughness curve method to determine soil fertility problems than the average chemical analysis save time and get good results.