The flowering period of rice is usually about one week.
On sunny days, rice blooms after 9 am and flowers are picked before 2 pm. The flowering time of early rice and middle rice is usually from 8: 00 am to 1 pm, and 9 ~ 1 1 is the full flowering period; The flowering period of single-season late rice and double-season late rice is mostly from 9: 00 am to 2: 00 pm, and the flowering peak is from 10 to 12.
Filling stage is a growing period of crops, that is, through? Produced by photosynthesis? Starch, protein, and accumulated organic matter pass through? A stage of assimilation in which they are stored in grains.
Extended data:
The filling period of rice refers to the period from the end of flowering to the maturity of grain. From a biological point of view, this is a process in which fertilized eggs develop into embryos and polar nuclei of fertilized eggs develop into endosperm. From the production point of view, this is the key period to form the final output. At this time, it is necessary to ensure sufficient photosynthetic area and smooth material transportation channels in production.
The length of filling period is closely related to varieties and climate. It usually takes about 30 days from full heading to harvest of early rice in southern China, and the filling time is about 10- 15 days. Mid-late indica hybrid rice is relatively long, and the end of filling is 25-35 days after full heading. In northern japonica rice, the filling period even exceeds 40 days.
The grain filling period is the key period to determine the yield of rice, and the field management should aim at protecting roots and leaves, preventing premature senescence, improving photosynthetic efficiency, promoting grain filling, and improving seed setting rate and grain weight.
The supplementary application of granular fertilizer depends on seedling, field and sky. Those with short yellow leaves and flag leaves should be supplemented, while those with dark green leaves and large flag leaves should not be applied; Thin fields are supplemented, and fertile fields are not applied; Apply more on sunny days, but not on rainy days. Generally, it is advisable to apply 2 ~ 3 kilograms of urea per mu during the intermission.
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