Study On Winter Wheat Frost Damage Based On Field Monitor

Late frost is one of main agrometeorological disasters affecting wheat yield in China. Late frost is not reversible, transient, characteristics such as time is early morning, late frost forecast and early warning is especially important. Late frost victims and drought has nature of difference, and is late frost victims of these features makes research of difficulty than other disaster more big, currently both at home and abroad on winter wheat late frost victims research main for table type research, and physiological research, and remote sensing research, and late remedy measures,but these research method are main for late frost victims occurred zhihou winter wheat of freeze symptoms, on reduced winter wheat because late frost victims and caused of loss no is good of reference value. This study, artificial cream box experiments provide an analytical basis for field monitoring, analysis of late frost in the process of photosynthetically active radiation, temperature, changes in leaf-air temperature difference and the differences between the different heights, as well as monitoring of disaster-causing factors impact on these three items.Tests were conducted in the Academy of agriculture and forestry experimental plots in Shangqiu city, including the two-part test:(1) different levels of low temperature on morphology indexes of winter wheat and its relationship of production factors,(2) Field of different heights, leaf temperature and leaf-air temperature difference in temperature changes, as well as the relevance of other environmental factors.Results displayed:, the air temperature is a late frost of winter wheat responses effective meteorological elements, and elements of morphological and yield of winter wheat were significantly correlated. 2, monitor real time monitoring of the field microclimate weather elements will more truly reflect the fields in the cooling process. 3 daily minimum temperature changes, height under the influence of 5cm humidity; the daily minimum leaf temperature in different height 5cm, 10 cm air temperature and high impact day maximum; leaf-air temperature difference 0-10 cm daily minimum temperature, 0-10 cm soil temperature, depth of 20 cm soil moisture as well as the level of the combined effect of daily minimum temperature.