关键词: 交替隔沟灌溉, 玉米, 水氮迁移, 水氮累积

Abstract: 【Objection】study the effect of alternative furrow irrigation on transport and acumulation of water and nitrogen in maize rootzone soil.【Method】little section was adopted for this experiment about maize. Treatments included: a. water, b nitrogen. The water and nitrogen treatments included: high level and low level. The mode of irrigation is alternate furrow Irrigation.【Result】NO3--N contents increased quickly after fertilization, most of it was concentrated in the sub-surface of 0-30cm. With the time went on, the upper soil water took the nitrogen contents down, and all this lead to the NO3--N contents of subsoil raised. The maximal accumulated NO3--N of low water and high nitrogen that gained at harvest time in the whole profile was 1.2 times of that of high water and high nitrogen. The accumulation of NO3--N of low water and low nitrogen was 1.27 times of that of low nitrogen and high water. The maximum residual value of NO3--N of per nitrogen fertilized was found in the treatment of low water and low nitrogen, the treatment of low water and high nitrogen was followed and the treatment of high water and high nitrogen was less. The treatment of high water high nitrogen was lest, in which the residual value of NO3--N of per nitrogen fertilized was only half of the treatment of low water and low nitrogen. After fertilizing the NH4+-N contents in the soil of sub-surface of 0-30cm reached a peak, and the contents basically did not change at the same level in the soil of 30cm below surface. The accumulation and distribution of NH4+-N of every treatment were basically the same. The level of water obviously effected accumulation and distribution of soil moisture. The acumulation soil water content of high water was obviously larger than that of low water. The level of nitrogen was not obviously affected of them.【Conclusion】The distribution and accumulation of NO3--N, NH4+-N and soil moisture were commonly affected by the amount of nitrogen application and irrigation. The treatment of high water reduced the accumulation of NO3--N in root zone, which lead to leaching and reduced nitrogen fertilizer use efficiency. The treatment of low water kept high content of NO3--N in root zone, helped the absorption of the crops and raised the efficiency of water and nitrogen. A positive correlation existed in amount of nitrogen application and NO3--N accumulation in root zone. Compared with NO3--N, the content of NH4+-N was lower and basically did not change. The best coupling form was the treatment of low water and high nitrogen.

Key words: Alternate furrow irrigation, Maize, water and nitrogen, Transport, Accumulation