再生稻田自生秧苗處理方法之研究

Study on Controlling Volunteer Rice in the Paddy Field

蘇昌吉(Chan-Chi Su)

《花蓮區農業改良場研究彙報》 4期 (1988/04) Pp. 5-6

摘要

自生秧苗是前（第一期）作收穫後掉落田間之稻穀發芽而形成，其在再生稻田中所扮演的角色如同雜草，與再生稻競爭養分及生長空間，影響再生稻之生產。本試驗之目的旨在探討使用具有較大選擇性之殺草劑控制自生秧苗及雜草之有效方法，以供改進再生稻栽培技術之參考。本試驗於民國七十五年在吉安鄉本場試驗田進行田間試驗。供試品種為台農秈18號，採用逢機完全區集設計，重複4次，10行區，行長4公尺，小區面積10平方公尺。試驗結果，以前作水稻收穫後3∼5天，每公頃施用5%丁基拉草粒劑60公斤及前作收穫後5∼8天，每公頃施用50%殺丹乳劑5公升加35%除草寧乳劑4公升或80.5%2.4-D可溶性粉劑1公斤等三處理對控制再生稻田自生秧苗及雜草較具實用性。在前作收穫後8∼12天，每公頃施用35%伏寄普乳劑1.5公升或80.5%2.4-D可溶性粉劑2公斤等兩處理，雖對控制自生秧苗之效果極為優異，但均對再生稻產生極明顯而嚴重的抑制作用，施藥後會使株高變矮，再生芽萌蘗數量及穗數減少，生育日數延長，並使稻穀減產，不適合使用。又5%丁基拉草粒劑30公斤／公頃之處理，雖對再生稻之生育及產量無影響，但對控制自生秧苗之效果較差（自生秧苗存活率高達58.28%），亦不適合使用。

並列摘要

Volunteer rice which grown from the lost seeds of the first crop had become a problem, like weeds, due to its space and nutritional competition with the ratoon crop. For improving the ratoon rice culture. The expariment was conducted to explore the efficient methods to control the volunteer rice and other weeds by applying herbicide with selectivity at Hualien DAIS in 1986. The rice cultivar TNGS 18 was used and a randomized complete block design with four replications were adopted, plot size was 10 m^2 which with 10 rows and 4m per row. Results indicated that among the 3 treatments, 60 kg/ha of 5% Butachlor G. applied at 3-5 days after lst crop harvest., 5 1/ha of Saturn E.C. adding 4 1/ha of 35% DCPAE.C. or 1 kg/ha of 80.5% 2.4-D S.P. which were applied at 5-8 days after lst crop has been harvested were efficient for controlling volunteer rice and weeds. Although the applications of 1.5 1/ha of 35% Onecide E.C. and 2 kg/ha of 80.5% 2.4-D S.P. had excellent effect on controlling volunteer rice, they injured the ratoon rice with lowered ratoon ability, shorter plant height, reduced panicles, prolonged days to maturity and decreased grain yields. The teatment of 5% Butachlor G. (30 kg/ha) was not practicable for controlling the volunteer rice because of its low controlling ratio (41.72%).