- 期刊
栽植密度及鉀肥用量對甘藷塊根大小及產量之影響
The Effect of Plant Densities and Potassium Fertilizations on Root Tuber Size and Yield of Sweet Potato
摘要
為探討甘藷插植密度與鉀肥用量對食用甘藷塊根大小及產量之影響，於1982年春秋作在桃園縣大園鄉及苗栗縣後龍鎮實施田間試驗。試驗處理採用3種插植密度：行距1公尺，株距分為0.15公尺、0.20公尺及0.25公尺，及3種鉀肥用量分別為每公頃180公斤、210公斤及240公斤，採3 × 3複因子試驗。試驗結果顯示，甘藷總產量受鉀肥用量及插植密度之影響。栽植密度太高，反而使甘藷總產量及大藷產量降低；增施鉀肥可增加甘藷總產量及大藷產量，而鉀肥施用量少則小藷產量反較高。密植可增加小藷塊根之形成，小藷之產量隨著密植程度提高而遞增，以插植密度為1m × 0.15m之小藷產量最高。適當增加插植寬度及增施鉀肥可增加甘藷塊根總產量及大藷產量，因此，可建議農民在栽培食用甘藷台農64號時，採用插植密度1m × 0.25m及每公頃施用鉀肥210公斤為宜。如考慮烤藷之小藷生產，則可以適度增加栽培密度及減少鉀肥用量。
關鍵字
無資料並列摘要
To study the effect of plant densities and potassium fertilization on the tuber size and yield of sweet potato, the field trials were conducted at Tayuan and Holung in the spring and fall croppings of 1982. The factorial experiments were laid out in a randomized complete block design with three plant densities: 1m × 0.15m, 1m × 0.2m and 1m × 0.25m; and with three rates of potassium fertilizer : 180 kg /ha, 210 kg /ha and 240 kg /ha of K2O.Experiment results indicated that the total root yields of sweet potato was significantly affected by different plant densities and potassium fertilization. High plant density caused the reduction in total tuber yield and the large-tuber yield. Higher potassium fertilization increased the yield of total tuber and large-tuber. On the contrary, lower potassium fertilization increased the yield of small-tuber. Higher plant densities also increased the yield of small-tuber. The yield of small-tuber was highest at 1m × 0.15m plant density. The yields of total tuber and large-tuber were increased at adequate condition of low plant density and high potassium fertilization. This study showed that cultivation of sweet potato Tainung No. 64 may be optimized with a plant density at 1m × 0.25m and at rate of 210 kg /ha of K2O. Otherwise, the cultivation with higher plant density and the lower potassium fertilization was suggested for consideration of the small-tuber production.