In recent years, rice planting area in China has been stablized at about 33 million ha with yield exceeding 5.7t/ha. The multiple cropping index of rice field (
<正> After three-year irregular and nine-year regular publication, Chinese Rice Research Newsletter, CRRN (ISSN 1005-4111), published by China National Rice Res
Background:Tropical dry forests cover less than 13%of the world's tropical forests and their area and biodiversity are declining.In southern Africa,the majo