秋季修剪及疏果對四季橘產期及產量之影響

Effects of Fall Pruning and Fruit Thinning on the Harvest Season and Yield of Calamondin Citrus (Citrus madurensis Lour.)

四季橘之收盆受產期之影嚮極大。為了調節四季橘產期，使農民能獲得最高效盆，進行不同時期之疏果及修剪處理，以了解其對四季橘開花、產期及產量之反應，並作為農民栽培之參考。處理分為3種不同之疏果及修剪時期（九月一日、十月一｀一一日）與無疏果及修剪之對照4種。採完全逢機設計，每處理3重複。疏果及修剪之植株分別將樹上果實全部疏除，並配合修剪徒長枝。試驗結果顯示，3種不同時期疏果及修剪之處理·植株大多於處理一個月後陸續開花。九月處理者，盛產期在三月，十月處理者，盛產期在四月；十一月處理者，盛產期在五月。總產量以對照最高，但與十一月及十月處理差異不顯著，九月處理者最低。處理植株之春果產量較對照植株提高143.5 %以上。估算之產期調節經濟效盆，以十一月修剪最佳，十月及九月次之，不修剪者最差。

The economic efficiency of calamondin is greatly affected by the supply of fruit. In order to increase the farmers'income, pruning methods that adjust the harvest seasons of calamondin must be studied. To provide information for farmers to follow, the responses of calamondin in harvest season and yield to three different pruning times were studied in this research. The experiment had a completely randomized design with three replications. The three pruning treatments each took place on September I, October I, and November I. Plants that were not pruned were used as control. All of the fruits were removed for the treated plants, and the vegetative branches were pruned. The results showed that all of the treated plants bloomed within one month after pruning. The full harvest seasons were in March, April, and May when pruned in September, October. and November, respectively. A lower total yield was found for plants pruned in September compared to the other two treatments and the control. However, no total yield differences were found among plants treated in October, November and the control. The fruit production in spring of all three kinds of pruned plants was more than 143.5% higher than that of the control. Best economic ben語ts were obtained from the pruning treatment in November followed by the pruning treatment in September and October. Plants without pruning treatment had the lowest economic benefits when compared to the pruning treated plants.