Abstract:
Effects of variety and cultivation conditions on production and yield factors of ratoon rice were studied. Various varieties of ratoon rice, stubble height for ratooning, and fertilization to promote budding were implemented in a L
9 (3
4) orthogonal experimentation to optimize the annual crop harvestof the first and second season ratoon rice. It was found that 10 cm-tall stubbles of Liangyou 616 fertilized with N 140 kg·hm
-2 would render the highest yield on both crops. The annual production of ratoon rice was affected in the order of:variety > stubble height > bud fertilization, with rice variety playing a prominent role.Grain yield of the first-season crop was affected byvariety, bud fertilizationand stubble heightin that order, with rice variety being the predominant factor as well.Duringthe second season, thegrain and paniclecountson the ratoon rice plants were affected by variety > stubble height > bud fertilization; while, the 1 000-grain-weight and seed setting rate, variety > bud fertilization > stubble height.Within the scope of this experiment, the aforementioned combination of variety choice, stubble height and fertilization wasrecommended for high outputof the ratoon rice cultivation.