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首页> 外文期刊>Soil Science and Plant Nutrition >Stability analysis of aggregates in relation to the hydrophobicity of organic manure for Sri Lankan Red Yellow Podzolic soils.
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Stability analysis of aggregates in relation to the hydrophobicity of organic manure for Sri Lankan Red Yellow Podzolic soils.

机译：斯里兰卡红黄Podzolic土壤团聚体的稳定性与有机肥疏水性的关系。

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摘要

Aggregate slaking is linked with rapid pressure buildup within aggregates. Soil water repellency may help hamper the pressure buildup within aggregates by reducing their wetting rates. We examined the effects of animal manure in improving aggregate stability, the hydrophobic effects of green manure, and the possibility of using organic manure mixtures to increase the aggregate stability for Sri Lankan red yellow podzolic soils using model aggregates. Almost all the cow dung (CD) added samples showed extremely low percentages of water stable aggregates (%WSA) demonstrating rapid destruction of aggregates. Although the addition of >=10% goat dung (GD) improved the %WSA, aggregate floating occurred, showing the risk of aggregate floating with runoff water. Addition of 5% GD would be an acceptable solution if the %WSA can be improved. Casuarina equisetifolia L. leaves (CE) was found to be a hydrophobic green manure. Although addition of >=5% CE increased the %WSA up to about 90%, aggregate floating occurred. The possibility of improving %WSA using 1-2% hydrophobic green manure in organic manures mixtures was tested. Samples with 5% GD+2% CE manure mixture showed the highest and the most stable %WSA without showing aggregate floating. Additions of compost and poultry litter were found not to be effective in improving aggregate stability with or without CE. Strong or higher water repellency was not observed in any of the samples with manure mixtures, showing that the addition of 1-2% hydrophobic CE would not induce detrimental effects of water repellency. There was no clear correlation between %WSA and the hydrophobicity of soils. However, the %WSA can be considered to show a tendency to increase with increasing hydrophobicity, because the %WSA was very high in samples with hydrophobic CE, the %WSA increased when mixed with 1-2% CE, and samples with highest water drop penetration time (WDPT) among all the manure mixtures showed the highest %WSA.
机译：骨料崩解与骨料内部的快速压力积累有关。拒水土壤可能会降低集料的润湿速率，从而有助于抑制集料内部的压力累积。我们研究了动物粪肥在改善集料稳定性方面的作用，绿肥的疏水作用以及使用有机肥料混合物使用模型集料增加斯里兰卡红黄荚果土壤的集料稳定性的可能性。几乎所有添加的牛粪（CD）样品均显示出极低百分比的水稳定聚集体（％WSA），表明聚集体被快速破坏。尽管添加> = 10％的山羊粪（GD）可以改善％WSA，但发生了骨料漂浮，显示了径流水导致骨料漂浮的风险。如果可以改善％WSA，则添加5％GD将是可以接受的解决方案。木麻黄（Casuarina equisetifolia L.）叶（CE）被发现是疏水性绿肥。尽管添加> = 5％CE可使％WSA增至约90％，但发生了聚集体漂浮。测试了在有机肥料混合物中使用1-2％疏水性绿肥改善％WSA的可能性。含5％GD + 2％CE肥料混合物的样品显示最高和最稳定的％WSA，而没有聚集体漂浮。发现在有或没有CE的情况下，添加堆肥和家禽垫料都不能有效地改善集料的稳定性。在任何带有粪肥混合物的样品中均未观察到强或更高的拒水性，表明添加1-2％的疏水性CE不会引起拒水性的不利影响。 ％WSA与土壤疏水性之间没有明显的相关性。但是，可以将％WSA视为随着疏水性的增加而增加的趋势，因为具有疏水性CE的样品中的％WSA非常高，与1-2％CE混合时以及具有最高水滴的样品中，％WSA会增加所有肥料混合物中的渗透时间（WDPT）显示出最高的％WSA。

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