Analysis of the farmland microclimatic characteristics of cold type wheat during milk-filling

Based on the observed data from farmland microclimate．the farmland microclimatic characteristics and it’s forming causes are analyzed．The results show that the illuminance of cold type wheat“Shaan 229”in row is 0．3～6．8klx lower than that of warlTl type wheat“9430”during milk-filling．The soil temperature in 0～0．2m and air temperature in row of“Shaan 229”are 0．2～3．5℃ and 0．2～1．9℃ lower than those of“9430”respectively．the water-vapour pressure and the relative humidity of“Shaan 229”in row are 20～170Pa and 1％～9％ higher than those of“9430”respectively．In other words，the farmland ecological environment of the cold type wheat is cooler and wetter．Those characteristics are caused by biological characteristics of cold type wheat，which are favorable to tolerate the dry-hot weather during milk-filling of wheat．