Netizen jssyzh88 sent an e-mail on July 21st: I am from Shuyang County. This year we have early earing phenomenon of individual rice. What causes this phenomenon? How to prevent?

There are many factors that may cause early earing of rice in production, such as accumulated temperature of rice seedlings, ripeness of rice, growth environment of seedlings, and nutritional conditions. Rice with early heading phenomenon has a small trophic level due to ear differentiation and development, and the resulting ear is also small. At the same time, due to early jointing and heading, the number of tillers after transplanting to the field is small, and the number of panicles is often small, so the yield is low.

The middle-maturing japonica rice varieties and japonica hybrid rice varieties planted in Fuyang and other places generally have higher temperature sensitivity and earlier matureness. When these varieties grow longer in Putian, seedlings in the late Putian are often malnourished due to seedlings sprouting, and their vegetative growth period will be shortened and they will enter the reproductive growth phase earlier (ear differentiation and development period). In Putian, early jointing and heading may occur; some start jointing in the paddy field and early earing occurs in the field.

This year, the mature harvest period of wheat in our province is generally delayed by about 7 days, and the transplanting period of the seedlings is also delayed accordingly. The rice planted at the normal time in previous years is generally extended. Under this condition, early heading phenomenon is easy to occur in rice, especially in some early maturing japonica hybrid rice varieties. If the seed is sown early and the pod age is too long, early heading is more likely to occur.

The situation reflected in the above emails is not very specific and clear, and therefore cannot be judged accurately. If the “individual rice” mentioned in the e-mail refers to the individual plots of rice, it is recommended to further investigate their age and seedling growth. The larvae are too long, the density of seedlings is too large, and the growth of seedlings in the late Putian period is weak, and it is easy to cause early heading of rice. If the “special rice” mentioned in the email refers to the phenomenon of early earing of individual rice, it is likely that the growth period of the rice is relatively short, and it is easy to advance as the age of the rice is too long and sowing is too early. Heading.

Later, when the larvae are too long and rice may appear early earing phenomenon, appropriate addition of urea and other nitrogen fertilizers to the seedlings will help reduce the occurrence of early earing. For rice plants with relatively long cultivars, appropriate application of nitrogen fertilizer after transplanting will also help reduce the occurrence of early earing, and at the same time promote the occurrence of tillering in rice and increase the number of per mu. When rice in the growing season has a tendency of early earing, appropriate application of nitrogen fertilizer will help to form larger vegetative bodies and increase the ear shape.

The early earing phenomenon of local rice appeared in mid-late July, and the main stem was usually eared early. The tillers, especially the tillers formed after transplanting, had a relatively large amount of vegetative growth and a relatively early stage of heading and could form larger ones. tassel. For these fields, fertilization can be appropriately increased to promote the growth of tillers and the formation of spikes, and the number of per mu per panicles can be increased, which can reduce the yield loss to some extent.

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