Agronomic principles and practices of rice ratooning
1988
De Datta, S.K. | Bernasor, P.C. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Ratooning offers the possibility of economically increasing rice yields where opportunities to profitably grow a second rice crop or an upland crop do not exist. Although rice ratooning has been practiced in many countries, it has not been widely adopted because of low grain yields and other problems associated with its culture. Screening trials identified varieties with good ratoon yield potentials. Through and deep tillage in the main crop enhanced ratoon tillering. More dense main crop planting led to higher ratoon tiller populations. Higher cutting height (about 15 cm) increased tillering, shortened crop growth duration and generally increased yield. Relatively low levels of N fertilizer application improved ratoon plant growth and grain yield. Delayed flooding (about 10 d after main crop cutting) considerably decreased proportion of missing hills, especially where stubble was cut at ground level. Weeds in the main and ratoon crop can be controlled by integrating cultural practices with herbicides. Insects and diseases common to the main and ratooned crops also can be controlled by using resistant varieties and appropriate insecticides. Effects of temperature and plant growth regulators were not consistent; further studies should examine growth regulators. Varieties with desirable ratooning ability and resistance to insect pests and diseases should be bred. Ratooning should be considered in the context of its economic viability in cropping systems.
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