Effect Of Controlled Alternate Partial Rootzone Irrigation On Soil Microorganism And Growth Of Maize

Water resource is the key of agriculture and the important basis of social economy's development. The water resource is comparatively deficient in our country, so developing water-saving irrigation is very necessary. Since the Controlled Alternate Partial Rootzone Irrigation (APRI) was proposed, many specialists who are devoted to water-saving irrigation have done many researches about this new irrigation technology such as the growth and assimilation ability of crop root, the growth of maize, the physiological condition, yield and and water use efficiency (WUE). And they have made a big progress on these aspects. But there are few people to do research about the soil microorganism by APRI. This water-saving irrigation technology will be perfected and farming will be guided availably by the study that is the effect on soil microorganism by APRI.The effects on soil microorganism's quantity and distribution, growth of crop and the correlativity between soil microorganism and soil parameter were investigated in a pot experiment of maize. The irrigation treatments included: a. conventional irrigation (Q), b. fixed partial rootzone irrigation (G), c. alternate partial rootzone irrigation (J). For each irrigation method, water was supplied by three levels: sufficient irrigation(C), milder water deficiency irrigation(Q), serious water deficiency irrigation (Z). Through the pot experiment, some conclusions were gained as follows:(a) The largest quantity of soil microorganism were gained on the condition of milder water deficiency irrigation by the same irrigation way and the quantity was even larger than sufficient irrigation some time. The growth of root and the quantity of soil microorganism were balanced in the two part of rootzone in APRI treatment. Because growth of the root in the dry rootzone is hindered in fixed irrigation, the quantity of soil microorganism in the two part rootzone is extremely different. This is suggest that the condition of soil water content and ventilation were ameliorated in the milder water deficiency irrigation treatment by the same irrigation way. It's benefit of the multiplying of soil microorganism. Because of the rootzone under APRI was kept in alternately dry and moist, at the time of provided the humidity that the life activity need, made soil be in nicer ventilate condition, provided the...