Effects of graft and nitrogen supply level on water consumption and water use efficiency of solar greenhouse cucumber under traditional irrigation.
常规灌溉条件下嫁接和增施氮肥对温室黄瓜耗水量及水分利用效率的影响

An experiment was conducted in solar greenhouse to study the effects of graft and different nitrogen (N) supply levels (0, 110, and 331 kg·hm-2) on the water consumption and water use efficiency (WUE) of cucumber (Cucumis sativus L.) under traditional irrigation. The results showed that when topdressing 331 kg N·hm-2, the water consumption of grafted cucumber was the highest, being 3 350 m3·hm-2 and 2 181 m3·hm-2 in winter-spring and autumn-winter cropping, so did the WUE, being 27.2 kg·m-3 and 36.9 kg·m-3, respectively. Comparing with those of self-rooted cucumber, the water consumption, economic yield, and WUE of grafted cucumber under the same N topdressing levels were increased by 3%-6%, 28%, and 20.9%, respectively, and the water consumption and WUE of grafted cucumber were increased with increasing N supply level. The water consumption of self-rooted cucumber also increased with increasing N supply level, but its WUE was the highest when the N supply was 110 kg·hm-2. It was indicated that graft could markedly promote the water consumption and WUE of cucumber, and the effect was more markedly with increasing N supply level. To increase N supply could also markedly promote the water consumption of self-rooted cucumber, but the WUE would be lower when excessive N was supplied.