Abstract:

In order to use the hereditary properties of japonica rice, reduce N applying rate and supply a foundation in rice breeding programme, the resistance of japonica rice to N stress was investigated. 110 different japonica rice germplasms were used in a soil pot culture and a field plot trial respectively. The main results were showed as following: The difference of the resistant ability to nitrogen deficiency between each individual rice germplasms used in the experiment was significant. According to the average values of membership function, 6 nonsensitive and 8 sensitive japonica rice germplasms to nitrogen stress were selected. The green leaf number and tillers at tillering stage, and the characters included straw dry weight, valid tillers, panicle length, spikelet number per panicle, grains per panicle and grain yield at harvest stage were all sensitive to nitrogen deficiency. These agronomic characters can be used as the indexes in screening rice tolerance to nitrogen deficiency program.