稻田轉作宿根高粱栽培技術之改良

Improvement of Cultural Practices for Ratoon Sorghum in the Paddy-Converted Dryland

曾勝雄(Sheng-Hsiung Tseng)

《臺中區農業改良場研究彙報》 31期 (1991/06) Pp. 13-21

https://doi.org/10.6956/BTDAIS.199106.0013

摘要

為提高稻田轉作宿根高粱之單位面積產量，於民國76年春作種植雜交品種臺中5號，收穫後繼行宿根栽培，探討切莖時間、切莖高度、留芽數多寡及氮肥施用方法對其農藝與產量性狀的影響。經由試驗結果得知，宿根高粱之切莖時間以收穫春作後2～12日為宜，延遲切莖除延長作物在本田時間外，亦因生育後期之低溫而使產量降低。切莖高度以接近土表最為適當，並可於切莖後10日以中耕機進行約10cm深度之培土作業，有利植株生長及提高產量。栽培宿根高粱時，半量氮肥可於切莖前一日用為基肥，其餘半量於切莖後20及40日平均用為追肥，另一種施肥方法為切莖後10及40日各施用半量氮肥，唯前者較能兼顧植株初期生長及幼穗發育，應有助於產量表現。

關鍵字

高粱 ； 宿根栽培 ； 稻田轉作 ； 產量

並列摘要

Experiments were conducted in 1987 to study the techniques of ratoon tiller treatment and N fertilization in order to improve the yield performance of ratoon sorghum cultivated after harvest of the spring or main crop. Experimental results indicated that the optimal time of cutting the stubble was 2 to 12 days after havest of the spring crop. Delayed cutting resulted in extended occupation of crop in the field and yield reduction due to low temperature during the grain-filling period. The height of cutting the stubble should be low or close to the ground level. Tillage at 10 days after stubble cutting to cover the ridge with 10-cm soil was also beneficial to the yield performance of ratoon sorghum. For the method of N fertilization, 50% of fertilizer as basal application could be applied at 1 day before stubble cutting, and 25% each could be top-dressed at 20 and 40 days after stubble cutting. An alternative was to apply 50% each of N fertilizer at 10 and 40 days after stubble cutting. However, the former method was recommended as it provided N for both early vegetative growth and panicle development of the ratoon sorghum.

並列關鍵字

sorghum ； cultural practices of ratoon ； paddy-converted dryland ； yield