Based on synchronous observations of micrometeorologial field elements and grainbearing rates by self mating in coldwater fields during a fertilitysensitive period of short lowtemperaturesensitive variety 64s of the sterile strain, study was made of optimal time intervals, depth and amount of irrigated water for the crop, called the “cold fertility” technique.

Field managements were also important to meet the demands of cold-water irrigation propagation.

Study on multiplication of a thermo-sensitive genic male sterile line of non-pollen type XianS in rice(Oryza sativa L.);

With different input into the model investigation is made of cold irrigation effect on the crop population structures and irrigative schemes, thus providing theoretical basis for the management of such rice growth.