The Infuleunces Of Different Irrigation Frequency On Maize Yield, N And P Unitilization Efficiency In Drip Irrigated Field

【Objective】Water and fertilizer are two key factors limiting crop growth and yield in arid area in Xinjiang. In the present study, a field experiment was carried out to investigate the different irrigation frequency and irrigation time on maize growth and yield. Meanwhile, the nutritional status of nitrogen and phosphorus were also explored and the nutrition utilization efficiency was analysised in drip irrigation condition.In irrigation quota optimization of 6750 m3/hm2 by setting the critical period of maize growth of irrigation frequency, comparative study of different irrigation frequency on the drip irrigation of Maize Dry Matter in accumulation dynamics, corn yield and nitrogen and phosphorus nutrient use efficiency. Through the above indicators to the irrigation frequency response, Developed region of Northern Corn Moisture and nutrients both efficient use of corn high yield and high efficiency optimization of drip irrigation water allocation strategy, for drip irrigated maize high yield farmland, the promotion and application of the high efficient utilization of water resources and fertilizer.【Method】This study was conducted in a field experiment conditions under local conventional irrigation 6750 m3 / hm2, the whole growth period divided into 7-10 times irrigation frequency of high density(105000 plants / HA) for drip Irrigated Maize Dry matter accumulation, nutrient and moisture absorption efficiency and yield. The plant nitrogen and phosphorus were determined by the method of nitrogen and vanadium molybdenum yellow colorimetry, and the ratio of yield and irrigation amount was used to calculate the water use efficiency of maize.【Result】1) Different irrigation frequency of drip irrigated has an effect on corn morphological index and dry weight accumulation, maize growth plant height and dry matter accumulation increased with the increase of irrigation times, in 10 times irrigation frequency T8 treatment((June 2 times, July 4 times, August 3 time, September 1 time) reached a peak, but with different growth period irrigation and irrigation distribution effect, the overall performance is 8 times irrigation frequency T4 treatment(June 2 times, July 3 times, August 1 time, September 1 time) strains and high dry matter maximal accumulation.2) Different irrigation frequency of drip irrigated has an effect on maize nitrogen absorption and utilization efficiency. Maize nitrogen uptake were increased with increase of irrigation frequency, the frequency increased, but with different growth period irrigation and irrigation distribution effect, T4 treatment nitrogen absorption maximum; nitrogen use efficiency, nitrogen partial factor productivity and nitrogen agronomy efficiency also showed the same rules, T4 treatment processing reaches the maximum value of maize nitrogen agronomic efficiency and nitrogen partial productivity and nitrogen utilization were 33.3 kg / kg, 5.76 kg / kg and 46.4%. respectively.3) Different irrigation frequency of drip irrigated has an effect on maize P absorption and utilization efficiency. Corn phosphorus uptake were increased with increase of irrigation frequency, the frequency increased, but with the growth period of irrigation and irrigation times affect the allocation, corn of phosphorus pigment accumulation and utilization and corn on the rules of nitrogen absorption and utilization of the same, T4 treatment processing reaches the maximum value of P agronomic efficiency, P partial factor productivity and P physiological efficiency were 93.1 kg/kg and 193.6 kg/kg and 186.3kg/kg. respectively.4) Different irrigation frequency has an effect on maize yield and its components, maize yield and its components increased with the irrigation frequency increased, and the 10 times T8 treatment reached the peak. 7 times irrigation frequency T1 treatment(June 1 times, July 3 times, August, September 1) yield constitute factors of grain number per spike and 1000 grain weight were significantly lower than those of other treatments and maize yield less than 15000 kg / hm2, showed that 7 times irrigation frequency on Maize Yield Component Factors of the formation of and make corn cannot obtain high yield(more than or equal to 15000kg/hm2) T4 processing yield the highest 19022 kg / hm2.5) Different irrigation frequency has an effect on maize water use efficiency(WUE), WUE with irrigation frequency increased first and then decreased, irrigation frequency increased 7 times to 8 times, water use efficiency(WUE) showed a gradually increasing trend, from 8 to 9 times irrigation frequency and WUE but a downward trend, the maximum value appeared at T4, WUE was 2.8kg/m3. The minimum value is T1 1.92 kg / m3.【Conclusion】1) Different irrigation frequency has an effect on maize nutrient absorption efficiency, yield and its component factors, high(10 times) irrigation frequency is helpful to improve maize on nutrient absorption efficiency, yield and yield component factors of the formation and low(7 times) irrigation frequency on corn on nutrient absorption profit and yield constitute factor grain number per spike and 1000 grain weight formation, and then influence the yield of maize. According to the different irrigation amount and irrigation times distribution in maize growing period under different irrigation frequency, the efficiency of nutrient uptake and utilization of Maize under 8 irrigation frequency T4 was the highest, and the yield was the highest.2) maize under high density cultivation conditions(>105000 plants / HA) at different irrigation frequency had a significant effects on water use efficiency of maize and yield in northen Xinjiang, 8 times irrigation frequency T4 treatment is the corn of drip irrigation in northern regions get water and nutrient resources both efficient use of high yield optimal irrigation frequency mode.