鐘麻根瘤線蟲病與D-D施用之效果（第二報）

Effects of D-D on Nematode Root-Knot of Kenaf (No. 2)

蔡雲鵬(Y.P. Tsai) ； 劉文珍(W.C. Liu) ； 游江海(K.H. You)

《中華農業研究》 6卷2期 (1956/08) Pp. 39-49

https://doi.org/10.29951/JARC.195608.0004

摘要

(一)施用255~377公升／公頃D-D之鐘麻根瘤線蟲病防治結果已詳載於第一報，爲明瞭255~377公升／公頃D-D的藥效持續期間及經濟的用量，進行數項試驗，其結果報告如下。
(二)43年5月11日施用255~377公升／公頃D-D之跡地，於44年4月28日播種鐘麻，其生育情形均不良，株高僅達127.64~140.4公分，且均罹嚴重的根瘤線蟲病。在臺南，根瘤線蟲病發生嚴重之地，255~377公升／公頃之D-D藥效不能維持1年以上，衹能供1期作物保護之用。
(三)43年9月21日施用300~600公升／公頃D-D之跡地，於44年4月7日播種黃麻，處理區黃麻生育均優良。播種後5個月，300、400、500及600公升／公頃D-D各處理區的罹病指數各爲51.56、43.43、36.85及41.25。300與400公升／公頃D-D兩處理區之聞的罹病指數差異較大，400~600公升／公頃D-D各處理區之間的罹病指數差異小。由此400公升／公頃D-D似爲經濟的用量。
(四)44年3月28日每公頃施用400、500及600公升D-D之地，於同年4月25日播種鐘麻，播種後5個月，其罹病指數各爲14.06、5.00及11.50，對照區爲94.06。精洗麻產量各爲1,189.99、1,089.99、1,313.33(D-D處理區）及476.66公斤／公頃（對照區）。D-D處理各區間的精洗麻產量隨D-D用量多而增加，但其間的差異小，惟與對照區比較，則增產713.33~836.67公斤／公頃精洗麻。

並列摘要

This paper gives the results of the experiments on the residual effect and effects of D-D mixture on nematode root knot carried out in Tainan Experiment Station, Taiwan Agricultural Research Institute China, in 1955.
1. Kenaf was seeded on April 28th., 1955, in the experimental farm where D-D mixture had been applied in the previous year (May 11th.) at the rates of 255, 322 and 377 lits. per hectare. Four months after seeding, the height of plants in the plots treated with DD was 136.9-141.05 cm. and 127.65 cm. in the control, and the disease index was 95-96.83 and 100, respectively. There are a little differences in both the height of plant and disease index between the treated and untreated.
Residual effect was not so high after one year in the plots injected with D-D at the rates of 255-377 lits. per hectare, accordingly this treatment may be effective only for one half year.
2. D-D dosages were used at the rates of 300, 400, 500 and 600 lits per hectare on Sept. 2lth., 1954, and jute was seeded on April 25th., 1955. The disease index read five months after seeding was 100 in the control and 51.56, 43.43, 36.88 and 41.25 in the treated plots, respectively.
3. D-D dosages were used at the rates of 400, 500 and 600 lits. per hectare on March 28th., 1955, and kenaf was seeded on April 25th., 1955. The disease index and products of retted hemp after five months were 94.06 and 476.66 kg/ha in the control, and 5.00-11.50 and 1,089.99-1,313.33 kg/ha in the treated plots, respectively.
4. Population of root knot nematode was reduced greatly by the use of 400-600 lits. per hectare D-D injected on March 28th., 1955, when kenaf and jute had been seeded in May and April of 1955, respectively, though less in the effect when applied on Sept. 2lth., 1954.
It may be concluded that 400 lits. per hectare of D-D is ecomomic dosage to be applied to the sandy soil of Tainan badly infested with root knot nematode.