The Study of Climate and Its Influence on the Flowering Period and the Plant's Age on Harvest Time of Durian Plantation (Durio Zibethinus Murr.) on Different Level of Altitude Area

This study is aimed at gathering the information on the correlation of climate variables and the Flowering period and the length of harvest time in durian plantation in the different altitude area. The method of research was survey in the central of local durian producer, which were categorized in 3 altitudes: 1) low altitude ( 600 m above the sea level). Two samples of local durian producer were taken from each altitude. The observation done was done during a year (from January 2011 until March 2012) over the precipitation and the temperature. The plant variables being observed was the flower from the initial show up until the blooming period and the length of the harvest time in each altitude. The methods of analysis used were correlation, regression by using SPSS for Windows in the Frequencies sub program. The result of the study shows that there is significant correlation between climate variables (the number of dry season months, the average temperature, maximum and minimum temperature) and the plantation variables (the formation of the flower buds, blooming period and harvest time) in different altitude. The precipitation intensity does not affect the flower buds formation and the length of harvest time, except the number of the dry months. The temperature, temperature difference (maximum and minimum) and minimum temperature have negative correlation towards Flowering period and harvest time in different altitude. The increase of altitude will long then the harvest time of local durian. The quantitative correlation between altitude and the flower budding formation period as well as with the harvest time, in cubic, is R 2 = 0.80 and R 2 = 0.79