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近年来引起我省注意的水稻“坐苗”,包括两大类群的生长障碍现象。一类是插秧后,稻苗长时间(40—60天以上)停滞不长,俗称发僵。在闽西北,这种病苗的日平均生长高度多数小于0.3毫米,插秧满月后株高只有14—22厘米;株型紧束,不分蘗,新根少,新叶比老叶短,枯尖和半枯叶片占60%以上;后期早枯或迟穗,成熟不齐或不稔不熟。另一类是发生在分蘗期以后,株型开散矮化,叶片生斑变色,终于早枯早衰,俗称病枯、秋衰(晚稻)或“黄帽瘴”等。这种病苗的叶片功能微弱,光合积累减少而呼吸消耗增长,后期同样早枯或灌浆不良。
In recent years, the province has attracted the attention of rice “sit Miao”, including the growth of two groups of obstacles. One is transplanting, rice seedlings for a long time (40-60 days) stagnation is not long, commonly known as stiff. In Northwest Fujian, the average daily growth rate of this disease is less than 0.3 mm, and the plant height after transplanting is only 14-22 cm. The plant type is tightly bundled without tillers, with fewer new roots and new leaves shorter than old leaves. And semi-dry leaves accounted for more than 60%; early late late or late spike, mature or unscrupulous. The other is occurred after the tillering stage, plant dwarf dwarfing, leaf spot discoloration, and finally withered premature senility, commonly known as disease blight, autumn decay (late rice) or “yellow hatchling” and so on. The role of this disease seedling leaves weak, reduced photosynthetic accumulation and respiratory consumption growth, the same early late dry or grouting poor.