| Aridity and water shortag are the most serious problems faced with chinese agriculture currently. Aridity always make some influences on crop any growth period, but the inflence degree are different from distinct growth periods, so we could drop the endnger grade of aridith to the lowest as long as we properly make use of moisture. Therefore, improving the moisture using efficiency of crop becomes the key of agriculture economizing on water, thereinto biological save on water is the most potential factor to elevate the crop moisture using efficiency. Canopy temperature has already been studied and applied as the weigh standard of crop water shortage,and recent years, it also becomes the important basis of genotype choice of crop drought-resistant, and it is closely related with crop moisture efficiency too. However, there is seldom study on the relations between canopy temperature of maize variety, output and moisture using efficiency, and basically there is no study reports on the relation between canopy temperature of maize variety and nitrogenous fertilizer efficiency. This thesis, based on handed infrared temperature detector and 19 maize varieties as material at Longdong district Gansu province in 2007, deals with the relations between canopy temperature of maize frouting period, output, moisture using efficiency, and nitrogenous fertilizer efficiency, we in order to provide some scientific basis for maize variey filtration of drought-resistant, save on water and nitrogenous fertilizer using efficiently. The mostly outcome of the test is as follows.1,Without reference to natural precipitation or personal irrigation, maize output of 19 distinct genotype(P<0.001),moisture using efficiencyWUE)(P<0.001),canopy temperature in grouting period(CT),and nitrogenous fertilizer using efficiency(NRE)are all achieved notable level. Average output of natural precipitation is 12023.55kg/ha, variation coefficient is 7.1%, Average output of personal irrigation is 13087.58 kg/ha, variation coefficient is 6.58%; Average numerical value of CT is 28.4℃disposaled by natural precipitation at grouting final period, variation coefficient is 2.58%, Average numerical value of CT is 24.6℃disposaled by personal irrigation, variation coefficient is 4.4%;Average WUE is 40.82 kg/ha.mm disposaled by natural precipitation, variation coefficient is 7.84%, disposaled by personal irrigation is 39.29 kg/ha.mm,variation coefficient is 8.26%;Average nitrogenous fertilizer using efficiency is 26.40% disposaled by natural precipitation, variation coefficient is 40.12%,disposaled by personal irrigation is 41.57%,variation coefficient is 50.74%. The study indicates: there is little difference between distinct genotype maize, and there is a notable linearity regression relation(P<0.001) between output of seed grain an WUE, output elevate 185.92 kg/ha -244.26kg/ha as WUE increase 1kg/ha·mm. Though the variety with high WUE always consumes more soil moisture, increase range of moisture consumation is notablly lower than the output increase range, its WUE greatly elevated.2,There is a canopy temperature altitude separated phenomena in the seed grouting period of distinct genotype maize, and the difference reflected on output and moisture using efficiency, whenever initial, middle, or final grouting period, the maize output disposaled by natural precipitation, the moisture using efficiency and the canopy temperature have a very notable minus-relativity(R2=0.445-0.634), besides along with the expeditation of grouting period or processation of procreating period, the relativity will increased. Along with the debase of CT, output will increase, the output of variety with lower CT could be higher, but the output of variety with higher CT could be lower. CT hoist 1℃each time in middle and final grouting period, the average output disposaled by natural precipitation will debase 619.72kg/ha, and the average output disposaled by irrigation will debase 384.24kg/ha, the average WUE disposaled by natural precipitation will debase 1.98kg/mm.ha, the average WUE disposaled by irrigation will debase 0.67kg/mm.ha.The time, mensurating the proper CT Numerical value, is final grouting period, 13:00-15:00 of every midday is the most proper time for menauration. Therefore ,CT possess upper dependability on estimating maize output and moisture using efficiency in the final grouting period, and it can be applied as a standards for efficiency maize variety choice.3,There is big difference between distinct genotype maize seed and straw stalk nitrogen nutrient content, but there is little difference between natural precipitation disposal and irrigation disposal. Average of 19 varieties, seed contain 1.36%-1.41% nitrogen, variation coefficient between varieties are 11.6%-15.59%;straw stalk contain 0.88% nitrogen, variation coefficient is 11.26%-12.59%. Nitrogenous fertilizer efficiency of different genotype maize mostly reflect on transfer from straw stalk nitrogen to seed nitrogen. Whenever natural precipitation disposal or irrigation disposal, there is a notable positive-relativity between output of different genotype maize seed and WUE,relative coefficient is 0.883,0.712. Along with the increase of seed nitrogen output, the moisture using efficiency increased too. The study results indicat,varieties with lower temperature in seed grouting period have upper metabolization, its rootage have better ability on absorbing nitrogen, and there is more nitrogen in its seed.Canopy temperature of maize grouting period has close relationship with moisture using efficiency and nitrogenous fertilizer efficiency, canopy temperature could be look as most important standards on filtrating varieties of drought-resistant, save on water and higer nitrogenous fertilizer using efficiency.
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