Studies on High-yielding Technology of Ratoon Rice

The growth progress, the ;path analysis of yield component, the growth regularity of regenerating buds and high-yield ing technology of ratoon rice were investigated. T.he results showed as follow:1.The duration from sowing to heading of the first crop rice showed differently due to planting area, varieties and sowing time. It is stable at about 60 days from the heading time of first crop rice to that of ratoon rice. So, it is necessity for growing ratoon rice that the everage temperature of ten-day periods 24C should be more than 60 days stably. According to quantity of heat resources distribution in Fujian, the ratoon rice with heading safly can be arranged to: 25N 800m,26N 600m,27N 500m,28N 400m. But, Shang You 63 should be 200m lower relevantly 2. Among the yield compenents, the number of panicles showed highest C.V and path coefficient to yield. The ratooning panicles distributed on stems from to 6th, node position. The growth date of regenerating leves and stems showed at the same time of panicle developing. So, the number of panicles was closely related with panicle quality. Therefore, promoting resting buds differentiation to increase thenumber of ratoon panicles showed very important to increase ratoon rice yield. 3. The h igh-yielding technical system of ratoon rice, a) Shang You 63 can be used in warm climate for ratoon rice plant. At the top of warm climate area, it should be sowed in middle of March, and at the low of warm climate area it can be sowed in late of March. 40-1. Shang You 64. V-You 64 are suitable in cool climate area for ratoon rice plant, and suitable sowing time is from late of March to April, b) At the 20 days after first crop rice heading the major fertilizer of N K should applied for regenerating shoots differentiation and at 1-2 days after first crop rice harvested supplement N K should be applied for regenerating buds growth, c) In the preceding stages of first crop rice, the field water level should be keeped low. after effective tillering it shoould be drianed. The middle and the late stages of first crop rice and ratoon rice growth duration the field should be irrigated intermittently, d) Harvesting height should be 10 cm over the 2 cond node from top.e) Ridge and bad culture methods should be applied in gleyed paddy soil far ratoon rice.