Study on the Regularity of Migration of Raptors and Its Relationship with Climate at East China Coast in Spring Environmental heterogeneity and revegetation on the Loess Plateau Influence of climatic condition on the spike number per plant of wheat Preliminary study on the appropriate cultivating season of high-quality rice formation in Jianghan Plain Effects of different combinations of planting density, row spacing and row direction on field microclimatic conditions and grain yield of maize Effects of growing process and climatic conditions on grain quality of spring-sown wheat