Accumulator can be used to determine the optimum seeding time for corn

Using the Accumulated Temperature Apparatus to Sample Maize, Describes the Method for Determining the Best Sowing Date of Corn Using Accumulated Temperature

The minimum biological minimum temperature of the seed germination was 5.0C, the minimum biological temperature in the growth period was 9.0C, the temperature in the second accumulated temperature zone in Heilongjiang Province was 7.°C, and the accumulated temperature was 2500-27,000C. The A variety was selected as the cultivar, and the A variety was A growth period of 115 days, the required accumulated temperature of 2400 to 2500.0C, after the test in B, the need for accumulated temperature 24150C, growth period 117d, the need for breeding period accumulated temperature 22150C, to determine the seedling stage and sowing method is as follows:

1 Use seedling temperature to determine seedling stage

In 1990, the long-term weather forecast in 1990, early frost occurred from September 21 to 23, mature period should be determined before September 21, give 80% guarantee rate, 5<1 mature before frost, and B 5<1 accumulated temperature in B. The guarantee factor 64.08, pushed forward by 5<1 from September 21 to September 15, so that the maturity period of breeds in B is set to September coincidence. Pushed forward from September to coincide with the date required to accumulate temperature during the growth period of A variety, is the correct emergence period of A variety in B, and the annual meteorological data measured during the calendar year. The average temperature for each ten-year period from September 15 forward. On May 24th, the accumulated temperature was accumulated to 2220.900C on a daily basis, which was just sufficient for the A variety to accumulate a temperature of 2215°C during the breeding period of B. Therefore, on May 24th, it was determined that the A variety was in the seedling stage of B.

2 Use activity accumulated temperature to determine the sowing date

Such as A species from the kind of water absorption began to germinate, to mature need to accumulate temperature is 24150C, the above from the emergence to the full maturation period has been used to 22150C, there are not satisfied from the sowing to the emergence of 200 °C accumulated temperature, the emergence period is set in May On the 24th, it should be pushed forward from May 23, and the daily average temperature of the weather data from May 3 to May 7 will be accumulated at 200.90C, just in time to meet the need for accumulating temperature of 2215°C in the breeding period of the A variety. Just to meet the accumulated temperature from the time that the water is sprouted to sprouting, we have decided that the sowing must be completed before May 7. According to agricultural demand, the best time for planting must be completed within one week. From May 6 onwards, planting should start from April 30. Therefore, the best sowing date should be determined from April 30 to May 6. End of the day. Actual A varieties were planted on May 7th in 1990. The seedlings were raised on May 24th and matured on September 16th.

3 Verification of emergence and sowing

3.1 Validation with Biological Temperature

From the germination of germinating maize to the lowest temperature of emergence biology of 50C, B has passed 5°C steadily throughout the year. The time is April 21st. When the stability passes 70C, it is April 27. We determine from April 30 to May 6. Day sowing. Actual measurement in 1990, April 17 has passed through 60C steadily. It has steadily passed through 70C on April 21. It has steadily passed 100C on May 6. The planting from April 30 to May 6 has fully met the minimum biological temperature requirement. The best sowing date is correct. If we do not need to accumulate temperature to determine the sowing date, it is necessary to determine the sowing date in accordance with the stability of the 50C and the period of April 21. It is necessary to have a premature phenomenon. In the past, due to the early planting, the species was very deep. Lessons.

3.2 Verification with Frost Day Termination Date

For example, if the average frost period last year is terminated on May 11th, we determine that the seedlings will be raised on May 4 and have missed the late frost period. The measured frost period ended in May 2nd in 1990. The minimum temperature for the post-emergence growth period is 90C. °C, the date starts on May 6th, and the A variety may reach the seedling on May 24th. It fully meets the biological minimum temperature requirements for the post-emergence growth period. Therefore, the crop grows vigorously and robustly. The seeding period is the best sowing date. of. If the seedling period is not determined by the accumulative temperature of the growth period, it will be planted at the lower limit of biology of 50C and April 17th, and the emergence of seedlings before May 1 will be endangered by the late frost.

3.3 Verification with growth period

We confirmed the emergence of seedlings on May 24, 1990 long-term weather forecast, early frost on September 21-24, a total of 121d growth period, and 115-117d fertility of variety A, which can fully meet the requirements for the growth period of A-species, before the frost. 5d has matured, and B has experienced an early frost on September 24th. From May 24th to September 24th, the growth period was 124d. The A variety has matured 6 y 7d before the early frost, which guarantees that it matures before frost. There is no waste of effective accumulated temperature. If the seedling period is determined solely by the growth period, it will be pushed forward from September 20 to May 27 for a total of 117 days. The sowing date will be May 13 to May 15. The planting will be at least late from April 30 to May 5. 8}10d, less accumulated temperature 141.6166.00C, resulting in the accumulated temperature during the growing period can not be satisfied, after the birth period is delayed, there is the danger of not coming up, the lessons of the past in some places in Heilongjiang Province affected by early frost has already demonstrated this point.

3.4 Verification with the accumulated temperature of 10°C

The accumulated temperature in the second accumulated temperature zone in Heilongjiang Province is 10,507,002C, and the guaranteed value of 1000C is 2,400-26,000C. It can fully satisfy the accumulated product temperature of 2415°C for Type A, the accumulative temperature of 2215°C for lo°C, and the accumulative temperature requirement during the growing season. In 1990, the X10 was measured. The accumulated temperature of °C is 2567.80C, which fully satisfies the requirements for heat conditions of A.

3.5 Verification with Provincial Standardized Maize Production Technical Procedures

According to 6.2 of Heilongjiang Province's standardization DT23B017-89 corn production regulation, the best sowing date for accumulated temperature from 2500 to 2700°C is from April 25 to May 5. We determine April 30 to May 5 as the best sowing date. Compliance with regulatory requirements.

Related Instrument Introduction: Accumulated Temperature Instrument Root Analysis System

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