@article{oai:u-ryukyu.repo.nii.ac.jp:02015512,
 author = {Hossain, M.A. and Yoshinaga, Anshun and Nakandakari, Tamotu and Murakami, Tetsuya and Sakai, Kazuhiro and Mojud, M.A. and 吉永, 安俊},
 issue = {1},
 journal = {沖縄農業},
 month = {Dec},
 note = {The effect of pre-monsoon irrigation for sugarcane production in Bangladesh was studied using six water regimes (irrigation treatments) with three replications. Irrigation water was calculated based on the ratio of irrigation water (IW) to cumulative pan evaporation (CPE) measured with USWB Class-A Open pan. The six treatments were: I_0 (no irrigation /control), I_1 (only one irrigation in the first week of plantation), I_2 (I_1 + late irrigation at IW:CPE = 0.25), I_3 (I_1 + late irrigation at IW:CPE = 0.50), I_4 (I_1 + late irrigation at IW:CPE = 0.75), and I_5 (I_1 + late irrigation at IW:CPE = 1.00). The germination rate of sugarcane eye buds in the irrigated plots was significantly higher than that in the non-irrigated/controlled plots. At 60 days after planting (DAP), I_3, I_4, and I_5 receiving 2 irrigation amounting 20 cm recorded significantly (P<0.01) the 28- 34% higher germination rate over the plots receiving only one irrigation/no irrigation. Treatment I_4 resulted in the highest germination rate (56.6%) and I_0 resulted in the lowest rate (37.91%). Treatment I_5 produced significantly (P<0.01) large number of tillers (212.58x10^3 ha^<-1>) following I_4 and I_3 which was 10.9- 42.0% higher over I_0 (149.29x10^3 ha^<-1>). The highest millable cane (124.46x10^3 ha^<-1>) was obtained from I_4 following I_3 and I_5 but the millable canes of these treatments were statistically identical and were significantly (P<0.05) higher (41.9%) over I_0 (72.22x10^3 ha^<-1>). Tiller mortality was higher (51.80%) in the control (I_0) than that in the irrigated canes (36.6-40%). However, irrigation did not significantly influence the sucrose content of the cane. There was a favorable influence of irrigation on the cane yield. The highest cane yield (114.42 t ha^<-1>), which is 40% higher than that with no irrigation (72.22t ha^<-1>) was produced by I_4 receiving 60-cm irrigation water. I_4 also produced significantly large quantity of sugar (12.32 t ha^<-1>), which was 42.6 % higher than that of the I_0 (7.07 t ha^<-1>). The total water used by the sugarcane increased linearly as the irrigation frequency increased. However, cane yield did not increase linearly with increasing water use. The highest WUE (0.70 t ha^<-1>cm^<-1>) was obtained from the irrigation treatment I_3 and the lowest (0.47 t ha^<-1>cm^<-1>) was obtained in I_0. Premonsoon irrigation of sugarcane with 48.5 cm water at IW:CPE ratio of 0.6 resulted in the highest cane yield (110.42 t ha^<-1>) and sugar production (11.82 t ha^<-1>) with WUE of 0.70 t ha^<-1>cm^<-1> and total crop water use of 157.74 cm., バングラディッシュのサトウキビ生産における雨期前の潅漑効果について，6つの水管理方法（潅漑方法）の実験を3回行った．潅水量の計算は，潅水量とA級開口式蒸発計（USWB）を用いて測定した累積蒸発散量との比を基に行った．潅漑方法は次の6水準である．I_0（潅水なし）I_1（植え付け1週間後に一度だけ潅水する）I_2（I_1＋IW：CPE＝0.25に達した時に潅水する）I_3（I_1＋IW：CPE＝0.50に達した時に潅水する）I_4（I_1＋IW：CPE＝0.75に達した時に潅水する）I_5（I_1＋IW：CPE＝1.00に達した時に潅水する）サトウキビの発芽率は，潅漑を行わなかった場合よりも，潅漑を行った方が明らかに高かった．植え付け60日後において，2度にわたって20cmの潅漑を行ったI_3，I_4，I_5では，1度だけ潅漑したものや，潅漑なしのものよりも発芽率が28.0％から33.5％高かった（P＜0.01）．発芽率が最も高いのはI_4で56.6％，最も低いのはI_0で37.91％であった．萌芽した芽の数が多いのはI_5（212.58×10^3ha）で，次いでI_4，I_3となり，これらはI_0（149.29×10^3/ha）よりも10.92％から42.00％多い（P＜0.01）．また，最大茎数はI_4（124.46×10^3ha）で得られ，次いで，I_3，I_5となる．しかし，これらの茎数は，統計学的な差はないといえる．また，I_0のそれ（72.22×10^3/ha）と比べると41.9％多かった（P＜0.01）．萌芽の枯死率は，I_0（51.8％）の方が，潅漑区（36.6％から40.0％）よりも高かった．しかし，潅漑によるショ糖量への影響は明らかにできなかった．潅漑がサトウキビの収量に対して，有利に影響していることが分かった．合計60cm潅漑されたI_4で収量（114.42 t ha^<-1>）は最大となり，潅漑しなかった区域の収量（72.22 t ha^<-1>）よりも40％多かった．また，I_4で得られた砂糖の量は多く（12.32 t ha^<-1>），これはI_0で得られた砂糖の量（7.07 t ha^<-1>）よりも42.6％多かった．また，サトウキビが消費した総潅水量は，潅水回数が増えるにしたがって直線的に増加した．しかしながら，サトウキビ収量は，消費水量の増加に伴って直線的な増加は示さなかった．有効水利用率はI_3で最も高く（0.70 t ha^<-1>cm^<-1>），I_0で最も低い（0.47 t ha^<-1>cm^<-1>）結果が得られた．サトウキビの雨期前の潅漑では，潅水量48.5cm，IW：CPE＝0.6の条件下で，最大収量（110.42 t ha^<-1>）と砂糖収量（11.82 t ha^<-1>）が得られ，その時の有効水利用率は，0.7 t ha^<-1>cm^<-1>で，総消費水量は157.75cmであった．, 論文},
 pages = {3--13},
 title = {Scheduling of Pre-monsoon Irrigation for Sugarcane Production using US Weather Bureau Class-A Open Pan},
 volume = {34},
 year = {1999}
}