The effect of climatic factors on twelve quality traits of eleven rice varieties (japonica and indica) was studied in the field as well as growth chambers. The field trials comprising 10～14 sowing dates were conducted at thirteen locations representing six diverse climatic regions of China. Six shading treatments were imposed on plants at full heading stage. Shading treatments consisted of 10, 25, 40, 55, 68, 80 per cent shaded area of plants and control. In another study, rice plants were transferred from ...