Single-cropping 第1页

ON THE HIGH-YIELDING PLANT TYPE OF SINGLE-CROPPING AND LATE-MATURING KENG RICE Effect of the change of rice planting system on the formation of outbreak population of brown planthopper, Nilaparvata lugens Nutrient balance in rice field ecosystem of northern China Rice field ecosystems in northern China Ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems