Effect Of Interaction Of Water And Nitrogen On Maize Growth And Nutrient Absorption Under Mulched Drip Irrigation

There is a huge contribution ability of food crops in the western semi-arid areas of Heilongjiang province, playing an important role in our country. But owing to the lack of water resources, the unbalance of temporal and spatial distribution, and the backwardness of irrational fertilization, lower fertilizer efficiency, the agricultural production is restricted directly in this region of the two main factors mentioned above. In order to finger out the best schemes about the N fertilizer and irrigation in the western semi-arid areas of Heilongjiang province, field plot test system was carried out under drip irrigation to study the effects of different water and nitrogen combination on the height of maize, the accumulations of chlorophyll, the ground of dry matter, nitrogen, phosphorus and potassium, respectively, and the production and yield component factors. The results showed that:1. The maize height increased with the process of growth stage, reaching the maximum at booting stage. At the same growth stage, the maize height also increased with the increase of N application amount, especially at the stage of jointing and bell, but there was no significant effect on the height at booting stage.2. The SPAD value increased with the increase of N application amount during the jointing bell stages, the more nitrogen, the higher SPAD. There was a positive correlation between the N application and chlorophyll content at the stages of jointing and bell. At the maize spinning stage, the nitrogen application resulted in a higher SPAD than control, but there was no significant difference between different N application amounts. Therefore, in booting stage there was no obvious connection between the N fertilizer application and chlorophyll content.3. The biggest dry matter accumulation of maize was generated in the process of W1N3. With the same nitrogen fertilizer, the dry matter accumulation, which increased with the increase of irrigation first, then decreased. With the same water, the maize dry matter accumulation increased with the increase of N application, and there were also significant differences between high nitrogen treatment and control.4. Nitrogen fertilizer could improve the accumulation of N, P, K significantly. In jointing and bell periods, the accumulation of the N, P, K booting stage increased with the increase of N application. With the same nitrogen, the N, P, K accumulation decreased with the increase of irrigation first, then increased, at the later period, which decreased again. With the same water, the accumulation of the N, P, K increased with the increase of N application. In the process of W1N3, the N, P, K accumulation were also the highest.5. With the same treatment of nitrogen, Wl had the best effect on the production and yield component factors. In W1 processing, the com ear length, ear coarse, spike weight, grain weight were highest in N1 processing, grain yield and grain weight per spike were highest in N3 treatment, but there was no significant difference between N1 and N3 in grain yield and grain weight per spike. The biggest gain yield was generated in the process of W1N3, but best economic benefits of the water and nitrogen combination was W1N1.6. Under the equal level of nitrogen treatment, there were no significant differences in the concentrations among the reducing sugar, starch, protein, soluble sugar. But under the equal level of water, the concentrations of reducing sugar, starch, com protein, soluble sugar were higher in N3 than others.7. According to the results in this research, with the drip irrigation under plastic film, the best N application and irrigation demand of maize in the western semi-arid areas of Heilongjiang province were 120 kg-ha,384 m3-ha, respectively.