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分根区交替灌溉已被证实是一种有效节水灌溉技术同时保持作物产量,但有关分根区交替灌溉提高作物氮素利用效率、降低对水土环境的影响机理还不是很清楚。为了探明地下滴灌条件下充分灌溉及分根区交替灌溉(APRI)对马铃薯水氮利用效率的影响,通过田间小区试验,对各处理马铃薯全生育期灌水量、植株体氮素残留、土壤氮素残留及水氮利用效率进行了比较分析。研究结果表明:收获后,APRI处理(E、I、K)与充分灌水处理产量(F、J、L)差异不大,但APRI处理灌溉水利用效率显著高于充分灌水处理(p=0.05);充分灌水处理不同土层(0～30cm和30～60cm)土壤中残留硝态氮、矿物质氮较APRI处理高;APRI处理(I、K)作物氮利用效率及农田氮利用效率显著高于充分灌水处理(J、L)(p=0.05)。因此,APRI处理不仅能够显著提高作物的水分利用效率,而且还能显著提高土壤矿质氮的活性,有利于作物对土壤氮素的吸收利用。
Alternate root zone irrigation has proven to be an effective water-saving irrigation technique while maintaining crop yield. However, it is not yet clear how alternate irrigation in the sub-root zone will increase the crop nitrogen use efficiency and reduce the impact on the soil and water environment. In order to explore the effects of adequate irrigation under subsurface drip irrigation and alternate rootzone irrigation (APRI) on water and nitrogen use efficiency of potato, the field experiment was conducted to evaluate the effects of APRI on the irrigation amount, plant nitrogen, soil nitrogen Elemental residues and water and nitrogen utilization efficiency were compared. The results showed that there was no significant difference between APRI treatment (E, I, K) and full irrigation treatment (F, J, L) after harvest, but APRI treatment irrigation water use efficiency was significantly higher than that of adequate irrigation treatment ; Nitrogen was retained in soil of 0 ~ 30cm and 30 ~ 60cm soil layer, and the content of mineral nitrogen was higher than that of APRI. The nitrogen use efficiency and nitrogen use efficiency of APRI (I, K) crop were significantly higher than those of APRI Full irrigation (J, L) (p = 0.05). Therefore, APRI treatment not only can significantly improve the water use efficiency of crops, but also significantly improve the activity of soil mineral nitrogen, which is beneficial to crop nitrogen uptake and utilization.