论文部分内容阅读
一、概 述 有机质在土壤肥力上的作用,有直接的和间接的。Thaer把土壤肥力和腐殖质等同起来,认为腐殖质是植物的营养物质,Liebig的矿物营养学说问世。后,长期以来人们认为腐殖质在肥力上的作用是间接的。但是,近二十年来,由于Blanchet(1957),Cha-minade(1966),christeva(1968),Flaig(1968),He-roando(1968),Soalbach(1957)等人的研究工作,有机质的直接作用又逐渐惹人注意了。然而,只要无机肥料能够满足供应植物必需的营养元素,土壤有机质在作为植物养料的来源这个方面来说,其重要性总还是次要的。土壤有机质的重要作用,还是在于它的间接作用,它能改善土壤的物理、化学和生物学性质,使作为作物生长介质的土壤更适于作物的需要。因此,维持适量的土壤有机质含量和适当的施用无机肥
First, an overview of the role of organic matter in soil fertility, there are direct and indirect. Thaer equates soil fertility with humus, believing that humus is a plant nutrient and Liebig’s theory of mineral nutrition comes out. Since then, the role of humus in fertility has long been thought to be indirect. However, for the past 20 years, due to the research work of Blanchet (1957), Chaminade (1966), christeva (1968), Flaig (1968), He-roando (1968) and Soalbach (1957) The role has gradually attracted people’s attention. However, the importance of soil organic matter as a source of plant nutrients is always of secondary importance as long as the inorganic fertilizers meet the nutrients needed to supply the plants. The important role of soil organic matter, or its indirect role, it can improve soil physical, chemical and biological properties, so that the soil as a crop growth medium more suitable for crop needs. Therefore, to maintain the appropriate amount of soil organic matter and the proper application of inorganic fertilizers