A method for determining the sowing date of early rice

Abstract

A method for determining the sowing time of an early season rice includes the following steps: (1), determining a sowing temperature period of the early season rice; (2), drawing a day average temperature-time curve graph according to weather change of fine days, cloudy days and rainy days in the7-th to 10-th day after spring festival so as to acquire the temperature change rhythm of an early season rice production area; (3), drawing 5-day slide average temperature curve into the day average temperature-time curve graph of the step (2), and analyzing a relation between a early spring temperature actual change rhythm and a early spring temperature theoretical change rhythm; and (4) using a local common sowing time forecast as a reference when the local day average temperature is close to the early season rice sowing temperature, and then determining the current year early season rice sowing time based on the law of the curve graph acquired in the step (3). The advantages of the method are that the method which determines the current year early season rice optimal sowing time through recorded day average temperature, the local common sowing time forecast and the 5-day slide average temperature can effectively avoid temperature errors due to the 5-day slide average temperature curve.

Description

technical field [0001] The invention belongs to the technical field of crop cultivation and tillage, in particular to a method for determining the sowing date of early rice. Background technique [0002] Rice is the main food crop produced and consumed by people in China and even Asia, and early rice is an important part of rice production. Due to the early sowing period of early rice, in areas where the active accumulated temperature is not rich, the sowing effect of early rice is often affected by the unstable temperature during the sowing period of early rice. The current sowing date of early rice is mainly determined by using the data of meteorological department. The method is mainly as follows: use the temperature value of the 5-day sliding average to correspond to the temperature requirements of the early rice sowing period. The specific temperature is based on the temperature index for normal growth of rice seeds (indica rice ≥ 12°C, japonica rice ≥ 10°C), and the ...

AI Technical Summary

Problems solved by technology

In a short period of time, the impact of temperature changes still exists; if the time is too long, part of the time will be lost, which will affect the subsequent crops in the production area

Or, choose a variety with a shorter growth period, which can reduce the impact on subsequent crops, but will reduce the yield of rice this season

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