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通过盆栽试验研究4种氮、钾水平下,不同生育阶段(苗期至抽雄期、苗期至拔节期和拔节期至抽雄期)实施根区局部灌溉对玉米干物质积累、水分利用效率和氮素利用的影响。结果表明,与常规灌溉相比,不同生育期根区局部灌溉处理耗水量均明显减少;苗期至拔节期分根区交替灌溉干物质积累降低甚微或略有增加;中氮、钾(N、K2O均为0.12 g/kg土)时水分利用效率提高22.8%,且氮表观利用率最高。在相同灌水方式下,中氮、钾水平干物质积累、水分利用效率和氮吸收利用较高,中氮、钾时苗期至拔节期分根区交替灌溉是一种节水高效模式。
Pot experiments were conducted to study the effects of topical irrigation on dry matter accumulation, water use efficiency and nitrogen of maize under four nitrogen and potassium levels at different growth stages (seedling to tasseling, seedling up to jointing and jointing to tasselling) The impact of prime use. The results showed that compared with the conventional irrigation, the irrigation water consumption in the root zone at different growth stages significantly decreased; the dry matter accumulation in the alternate irrigation at the seedling stage to the jointing stage had little or slight increase; , K2O was 0.12 g / kg soil), water use efficiency increased by 22.8%, and nitrogen apparent utilization rate was the highest. Under the same irrigation pattern, dry matter accumulation, water use efficiency and nitrogen absorption and utilization of medium nitrogen and potassium were higher, and that of medium nitrogen and potassium alternate irrigation was a water saving and high efficiency mode.