| Sowing with water of absolved water-storing irrigation technology is one kind of drought resistance and seedling protection measures which unable winter or spring irrigation in the arid simarid area. Because of the water injection rate to be limited when sowing with water, after evaporates and the side infiltrates the kind of seed position soil moisture content to reduce very quickly. Under synthesis consider of water lacks and suppression moisture evaporation foundation, the advanced water saving irrigation technology and the chemistry regulation technology of soil moisture was organic synthesis. Study on application water-holding agent when sowing with water of obsolved water-storing irrigation technology will opens a new road for the water resources in short and cost high water area saving water production increase.The growth dynamics, water consumption law and yield effects was studied under the conditions of application water-holding agent when sowing with water of absolved water-storing irrigation on field maize during the month 4~10 of 2008 in Minqin experiment base of Gansu Provincial water conservancy research institute. Six treatments were designed, the conventional irrigation was determined to check(CK), other treatment application water-holding agent when sowing with water.The injection water was 240m3/hm2, application water-holding agent was 0g/m2 (YB0), 0.5g/m2 (YB0.5), 1.5g/m2 (YB1.5), 2.5g/m2 (YB2.5) and seed dressing use water-holding agent (YBH) treatments. After observation soil moisture proliferation rule, the corn growth indexs, water consumption rule, output, water use efficiency and the economic efficiency and so on, obtain application water-holding agent when sowing with water of absolved water-storing irrigation technology to be practical and feasible. The main conclusion as follows:1. The soil moisture horizontal and vertical proliferation are slower after sowing with water of YB2.5 and YBH treatment, in origin of injection water the soil moisture was high but lower in far-off areas from origin. The role of water-holding agent was obvious in the initial, with the application of water-holding agent concentration increased, the smaller the soil evaporation, water conservation results will be significant.2. Compared with other treatments YB2.5 and YBH can advance seedling emergence, less affected by the drought, extend flowering to filling to maturity stage, its leaf area index a was very significant difference.Compared with not application water-holding agent the treatment of sowing with water application water-holding agent not only increased leaf area index, but also the crop is not premature in later growth stage and slower decline of leaf area index, green leaf stage duration long. In seedling and follow-up growth stage YB2.5 and YBH vigorous growth, plant sturdy, tall, dry matter accumulation faster, and with the increasing concentration of water-holding agent the accumulation of material also increased of maize. Compared with CK the spike dry matter's proportion were higher while the proportion of stem material are lower than CK.Application water-holding agent can impel maize premature, increase spike weight, stem weight, furthermore increase production.3. Between the treatments of sowing with water the water storage no difference before sowing but after application water-holding agent sowing with water treatment soil water storage of YB2.5 was very significant difference and YBH was a significant difference with other treatment.The soil moisture content was more dramatic fluctuations after jointing impact of irrigation, with the continuous advance of growth stage moisture curve a number of peaks and valleys. The water consumption was small than CK by application water-holding agent. The water-holding agent has the role of saving water and reduce invalid evaporation.The water consumption was also related to the amount of water-holding agent application,the more water-holding agent application the less water consumption.Proper application of water-holding agent will not only enhance water use efficiency in seedling stage but also increase water use efficienc in late growth stage.4. Compared with CK treatment YB2.5 and YBH can increase yield 17.77 % and 15.13 %, save water 13.92% and 18.76 %, increase income 15.73 % and 26.37%. The grain weight, spike weight and panicle length production constitutes was the main factor but the long of bare top , one hundred seeds weight and ear rows does not affect maize production. The theoretical maximum output of maize was 18545.19kg?hm-2and the evaporation of water was 5690.27m3/hm2 when required for maximum production.5. Use of Jensen model to solving the sensitive index, in grouting to mature stage the sensitive index was biggest.The water production function was more accurate use this model compared with the measured the calculated production output difference in 2.2-10.11%. Absolved water-storing irrigation application water-holding agents when sowing with water can eliminates winter irrigation water and reduce invalid evaporation during the winter, reduce irrigation water 1800-2700m3/hm2 in growing period of maize, can significantly increase production of water-saving effect. |
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