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A pot experiment was conducted under water deficit and adequate water-supplied conditions with two maize genetypicvarieties (Shaandan 9 and Shaandan 911) to study the effects of nitrogen, potassium and glycinebetaine (GlyBet) on thedry matter and grain yields as well as water use efficiency (WUE). Determinations were made at different stages of the twovarieties for revealing the function of these factors in increasing plant resistance to drought. Results showed that undera water-stressed condition, dry matter and grain yield were significantly reduced. However, the response of the twovarieties to water stress was different: Shaandan 9 was significantly higher in dry matter and grain yields, and thereforecould be regarded as a drought-resistant variety compared to Shaandan 911.Application of nitrogen, potassium andglycinebetaine raised dry matter and grain yield to different levels, and thereby alleviated the water stress and increasedwater use efficiency. These effects were higher for Shaandan 911 than for Shaandan 9. Under water-stressed conditions,application of N fertilizer, either at low rate or at high rate, significantly increased dry matter, grain yield and water useefficiency. A significant different effect was found for Shaandan 911 between N rates, but not so for Shaandan 9. However,with supplemental water supply, effects of N fertilization were obviously decreased, showing that in addition to supplyingnutrient, N fertilizer has a function in increasing drought-resistance of the crop. Potassium and glycinebetaine exhibited aremarkable function in increasing dry matter and grain yields as well as water use efficiency under water stress while sucheffects were obviously declined, even vanished, with supplemental water supply, indicating the important contribution ofthese factors in rise of drought-resistance ability of a crop.
A pot experiment was conducted under water deficit and adequate water-provided conditions with two maize genetypicvarieties (Shaandan 9 and Shaandan 911) to study the effects of nitrogen, potassium and glycinebetaine (GlyBet) on the dry matter and grain yields as well as water use efficiency (WUE). Determinations were made at different stages of the twovarieties for revealing the function of these factors in increasing plant resistance to drought. Results showed that dehydra-stressed condition, dry matter and grain yield were significantly reduced. However, the response of the two varieties to water stress was different: Shaandan 9 was significantly higher in dry matter and grain yields, and therefore could be considered as a drought-resistant variety compared to Shaandan 911. Application of nitrogen, potassium and glycine betaine raised dry matter and grain yield to different levels , and so alleviated the water stress and increased water use efficiency. These effects were higher for Shaandan 911 than for Shaandan 9. Under water-stressed conditions, application of N fertilizer, either at low rate or at high rate, significantly increased dry matter, grain yield and water useefficiency. A significant difference effect was found for Shaandan 911 between N rates However, with supplemental water supply, effects of N fertilization were obviously decreased, showing that in addition to supplying nutrient, N fertilizer has a function in increasing drought-resistance of the crop. Potassium and glycine betaine aremarkable function in increasing dry matter and grain yields as well as water use efficiency under water stress while sucheffects were obviously declined, even vanished, with supplemental water supply, indicating the important contribution of the factors in rise of drought-resistance ability of a crop.