Characteristics of Heat Damage during Flowering Period of Summer Maize and Suitable Sowing Date in North China Plain under Climate Change

doi:10.3969/j.issn.1000-6362.2020.01.001

Abstract

Abstract: Using the daily ground observation data of 55 meteorological stations in the summer maize planting area of North China Plain from 1981 to 2017, annual heat damage events of summer maize was calculated by taking the daily maximum temperature ≥35℃ lasts for 3, 4, 5 days, as well as the relative humidity ≤70% as an indicator for light, medium and severe high temperature heat damage, respectively. The temporal and spatial variation characteristics of high temperature heat damage during the flowering period of summer maize under different sowing dates in the North China Plain were analyzed at the decadal scale, annual scale and ten-days scale. With the standard of avoiding medium high temperature heat damage at flowering stage, the suitable sowing dates for summer maize were then estimated. The results showed that the greatest frequency of heat damage at flowering stage of summer maize was found when sown in early June. And if planted in mid-June, the frequency of heat damage was 9%-12%. However, the heat damage has been increased since 2011, and the occurrence probability is higher than that in the P1-P3 period (1981-2010). The average suitable sowing date of early-maturity varieties in North China Plain is from June 15th to July 5th. That of mid-maturity and late-maturity varieties were from June 15th to June 27th and from June 15th to June 20th respectively. Within the suitable sowing period, planting should be postponed appropriately in the southern part of the North China Plain. And in the north, it should be earlier.

Key words: North China Plain, Summer maize, High temperature heat damage, Sowing date

HE Hua-yun, HU Qi, PAN Xue-biao, MA Xue-qing, HU Li-ting, WANG Xiao-chen, HE Qi-jin. Characteristics of Heat Damage during Flowering Period of Summer Maize and Suitable Sowing Date in North China Plain under Climate Change[J]. Chinese Journal of Agrometeorology, 2020, 41(01): 1-15.

References

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