Responses Of Maize Physiological Parameters On Jointing Stage Under Water Stress

Drought and water shortage are severe problems in our country, which seriouslyrestricts the agriculture development and food safe.The agricultural water shortagescaused by drought threatens food production. With increasing population, demandcontinues to grow food crops, such threats will be more serious. As China’s importantfood and economic crops, corn occupies an important position in all crops. Cornrequires large amount of water in dry land crops. Corn is very sensitive to droughtstress.Drought is an important factor in a lot of low-yielding corn, which seriouslyhamperes corn production. Regional distribution of corn is mainly in the north,northeast, northwest, and other arid and semi-arid regions, in which the severedrought leaving maize production. Therefore water-saving irrigation and increasewater use efficiency of corn have become necessary.Irrigation of corn is based on corn drought monitoring.With the rapiddevelopment of remote sensing technology, it is possible to use remote sensing toolsfor real-time dynamic monitoring of the drought.This is more convenient and faster.In this paper, the parameters of remote sensing NDVI, PRI, QY and other spectralinformation is used to monitor water stress and take a test for corn water stress. Thiscan provide guidance for future large-scale drought monitoring and irrigation usingremote sensing tools.This article takes experiments using the sweet corn18as material Confucianismin open field, processing varying degrees of water stress in corn jointing. This articlestudies the influence of water stress on maize potential, fluorescence QY, NDVI, andPRI. In studing physiological parameters under water stress jointing stage, this articlegets mechanism the corn for drought stress.This helps find the best moisture threshold to corn. This paper achieves goals both water-saving and increasing productionpurposes.The main conclusions are as follows:1Water stress in jointing stage of the corn will suppress water potential, QY,NDVI and PRI.This will takes inhibition effect on transpiration and photosynthesis.2Rehydrated on corn after water stress,corn water potential, QY, NDVI andPRI will appear compensation phenomenon. However, the effect size is limited by theextent of the compensation-related stress. Mild size stress can make corn leaf waterpotential, QY, NDVI and PRI to return to normal level in a very short period of time,even more than the normal level. This is called beyond compensation effect. Moderateand severe degree of stress treatments will also produce corn compensation effect，butwith the severity of stress, the corn can not reach normal level in the control group.3Looking from the compensation effect: Jointing of water stress should be mildsize stress.4Comprehensive discussing the water stress influence on QY, water potential,PRI and NDVI, it is appropriate to choose QY as the experimental parameter.