第4卷‧第2期,
197602
, pp. 42-48
?稻品種穗上發芽與休眠性之調查研究
- 作者:
李祿豐
- 作者服務機構:
臺北區農業改良場
- 中文摘要:
本研究目的係探討臺灣北部多雨地區,第二期作成熟期因連續性降雨,致發生穗上發芽之損失率進行調查,並同時舉辦梗稻品種間休眠期測定和產量試驗,其結果如下: 1.在連續十天雨季中,稻株在田間之發芽損失率,直立者為15.3%,倒伏者為25.6~27.7%,全株浸水區為50.8%。顯示倒伏又浸水區之損失頗為嚴重。 2.在雨季中,農家稻田種植無休眠性之品種,其穗上發芽率分佈介於12.12~44.09%,平均為30.43%。 3.以十三品種,黃熟期田間穗上發芽谷調查結果,連續六天降雨時,平均發芽率為10.66%。降雨十天時為25.09%。降雨日數愈長,損失愈大。 4.本省推廣之梗稻品種,濕谷測定發芽日數結果,以臺中184號及臺南5號,自黃熟後之谷粒發芽日數而言,前者需九日,後者為八日。 5.臺南5號新鮮稻種,於第二期作低溫環境下,需八天始能發芽,而風乾四天後之稻谷,其發芽率達50%時需八天,比其他品種多出二一四天之休眠日期。其單位面積內稻谷收量也超出臺中65號及臺北309號1~4.3%。 6.在二期作多雨地區(宜蘭縣)與少雨地區(臺北縣),比較品種分布情形結果,臺南5號在多雨地區之種植面積佔82.7%,反之在少雨地區僅有2.7%。 7.無休眠期之稻種,如臺北309號,在少雨地區(臺北縣)之種植面積為50.4%,而在多雨地區僅有0.7%。
- 英文摘要:
This research aims to study the rateof panicle germination and the varietalvariation during the rainy season ofsecond rice crop in northern Taiwan.Results of the study are concluded asfollows:1) For 10 continuously rainy days, the rates of panicle germination are: a, erectoid 15.3%, b, lodged 25.6-27.7 %, and c, flooded paddy 50%.2) For the varieties with no seed dor- mancy, the panicle germination ranged 12.1-44.0%.3) For the 13 studied varieties, averaged rates of panicle germination were 10.7 and 25.1% for 6 and 10 contin- uously rainy days respectively.4) Varieties Taichung 184 and Tainan 5 were found carrying seed dorma- ncy.5) Variety Tainan 5 has a seed dorm- ancy of 8 days, 2-4 days longer than most commercial varieties. It outy- ielded Taichung 65 and Taipei 309 by 1-4%.6) Variety Tainan 5 had 82.7 and 2.7% of the total hectareage at raing I-Ian and less rained areas of Taipei.7) Variety Taipei 309 with no seed dormancy had 50.4% hectareage of rice paddy at Taipei and 0.7% at I-Ian.
- 中文關鍵字:
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- 英文關鍵字:
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