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近年来一些研究结果表明,有机和无机肥料氮当季约有1/3至1/2残留于土壤中,在不施肥的条件下,这些残留肥料氮再度被作物吸收利用率极低,下茬作物所需氮素95%以上由土壤提供.为进一步研究残留肥料氮的矿化利用状况,探索提高其利用率的途径,五十年代以来,应用矿化率法进行土壤氮素肥力研究的报道很多,但在理论上均不够完整.1972年,Stanford和Smith在以好气间歇淋洗培养法测定土壤氮矿化率的基础上进一步导出土壤氮“矿化势”N_0值的概念.
In recent years, some research results show that about 1/3 to 1/2 of organic and inorganic fertilizer nitrogen remain in the soil during the season. Under the condition of no fertilization, these residual fertilizer nitrogen is again absorbed and utilized by the crop very low. In order to further study the mineralization and utilization status of nitrogen in residual fertilizers and to find ways to improve the utilization rate of nitrogen, more than 95% of the nitrogen required for crops is provided by soil. Since the 1950s, studies on soil nitrogen fertility using mineralization rate have been reported A lot, but not enough in theory.In 1972, Stanford and Smith further derived the concept of N_0 value of soil nitrogen “mineralization potential” on the basis of the determination of soil nitrogen mineralization rate by aerobic intermittent leaching culture method.