摘要
[Objective] The aim was to study the characteristics of accumulative potato biomass in different sowing dates and their relationships with the climate factors in Tianshui City.[Method] Based on the potato sowing experiment by installments in Tianshui agrometeorological experiment station in 2009,the potato's growth periods in every sowing date were contrasted with the average sowing period.Moreover,the climate resources' occupied amounts,the accumulative progresses of tuber's fresh biomass in every growth period were contrasted with the average sowing period.[Result] The results showed that the days of whole growth period in every sowing date tended to be same with the average period.The accumulative temperature's occupied amounts of every critical temperature had little difference,but the solar radiation and precipitation had great difference.The nonlinearity correlation between tuber's fresh biomass accumulation and the accumulative temperature (≥10℃) was obvious.When the accumulative temperature(≥10℃) was about 1 100℃,it was the turning point which the accumulative velocity of tuber's fresh biomass changed.The accumulation of tuber's fresh biomass in every sowing date had little difference before the inflorescence formation period.After the inflorescence formation period,the accumulative velocity of potato tuber's fresh biomass in the sowing date which was 7 days later than the average sowing period was greater than other sowing dates.[Conclusion] The optimum sowing date of potato should be in the end of early April.It had the negative effects to promote potato's yield by sowing early and too late.
[Objective] The aim was to study the characteristics of accumulative potato biomass in different sowing dates and their relationships with the climate factors in Tianshui City.[Method] Based on the potato sowing experiment by installments in Tianshui agrometeorological experiment station in 2009,the potato's growth periods in every sowing date were contrasted with the average sowing period.Moreover,the climate resources' occupied amounts,the accumulative progresses of tuber's fresh biomass in every growth period were contrasted with the average sowing period.[Result] The results showed that the days of whole growth period in every sowing date tended to be same with the average period.The accumulative temperature's occupied amounts of every critical temperature had little difference,but the solar radiation and precipitation had great difference.The nonlinearity correlation between tuber's fresh biomass accumulation and the accumulative temperature (≥10℃) was obvious.When the accumulative temperature(≥10℃) was about 1 100℃,it was the turning point which the accumulative velocity of tuber's fresh biomass changed.The accumulation of tuber's fresh biomass in every sowing date had little difference before the inflorescence formation period.After the inflorescence formation period,the accumulative velocity of potato tuber's fresh biomass in the sowing date which was 7 days later than the average sowing period was greater than other sowing dates.[Conclusion] The optimum sowing date of potato should be in the end of early April.It had the negative effects to promote potato's yield by sowing early and too late.
基金
Supported by The Special Project of Service Industry in National Science & Technology Ministry (GYHY200806021)
