红壤旱地或红壤荒山新辟稻田的头一、二年栽种水稻,在稻苗进入幼穗分化期、孕穗期直到出穗前后,田间往往出现黄苗。黄苗首先表现在老叶和下部叶片上,一般是自上而下的第四第五片功能叶先发黄,以后逐渐向上 Red soil dry land or red soil barren hills Paddy rice fields in the first one or two years planted rice, rice seedlings into the panicle differentiation, booting until the ear before and after the emergence of yellow seedlings often appear in the field. Yellow seedlings first manifested in the old leaves and the lower leaves, usually top-down from the fourth fifth five-leaf function first yellow, then gradually upward