论文部分内容阅读
根据在山东禹城试验区多年培肥节水试验证明：土壤有机质具有改善土壤物理性质、增加土壤水分库容、抑制土壤水分蒸发、增加降水入沙、拓宽土壤有效水含量、提高土壤保水供水性能的作用；土壤有机质由７．２ｇ／ｋｇ增加到１３．２ｇ／ｋｇ以上时，土壤水分利用率由１．０８～１．６８ｋｇ／ｍｍ提高到１．５６～３．１１ｋｇ／ｍｍ，节水３０％左右。通过增加土壤有机质可将土壤含水率的灌水下限指标由以往田间持水量的６０％～８０％降低到５５％左右，仍可获得高产，土壤有机质在节水农业中起着重要作用。
According to years of fertilization experiment in Yucheng experimental area in Shandong Province, it is proved that soil organic matter can improve physical properties of soil, increase soil water storage capacity, inhibit soil water evaporation, increase precipitation into sand, broaden soil effective water content and improve water and soil water supply performance Soil organic matter increased from 7.2g / kg to above 13.2g / kg, the soil water use efficiency increased from 1.08-1.68kg / mm to 1.56-3.11kg / mm, water saving was 30% about. By adding soil organic matter, the lower irrigation index of soil water content can be reduced to about 55% from 60% ~ 80% of the previous field water holding capacity. Soil organic matter plays an important role in water-saving agriculture.