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腐殖质对土壤的物理性状和肥力因素(水分、养分、空气、热量及其他状况)有全面的、良好的影响,归根到底就是直接或间接地保证农作物丰产。随着森林草原黑钙土中腐殖质含量从3％增加到5％,谷类作物产量平均也从17公担/公顷增加到28公担/公顷,玉米产量从14公担/公顷增加到240公担/公顷,糖用甜菜产量从162公担/公顷增加到240公担/公顷。但是土壤肥力的高低不仅仅取决于腐殖质的数量,而且也
Humus has a comprehensive and good effect on soil physical properties and fertility factors (moisture, nutrients, air, heat and other conditions), and in the final analysis is directly or indirectly ensuring high crop yields. As the humus content increases from 3% to 5% in the chernozem in the forest steppes, the average grain yield increases from 17 to 28 km / ha and the maize yield increases from 14 to 240 km / Hectare and sugar beet production increased from 162 to 240 km / ha. But the level of soil fertility depends not only on the amount of humus, but also