|Title:||Response of Rice Yield in Relation to Solar Radiation and Air Temperature under Soil||Other Titles:||土壤缺水時水稻産量與日照及氣溫之關係||Authors:||Chwen-Ming Yang
|Keywords:||Rice;Yield;Solar radiation;Heat summation;Water deficits;水稻;產量;日照量;累積氣溫;缺水||Issue Date:||8-Nov-1993||Publisher:||中華農業氣象學會||Journal Volume:||1||Journal Issue:||1||Start page/Pages:||27-34||Source:||中華農業氣象||Abstract:||
The influence of solar radiation and air temperature, in conjunction with soil water delficits occur red at vegetative growth and panicle formation stages, on yield of rice (Oryza sativa L. cv. Tainung 67) was studied during the growing seasons of 1991 to 1993. Five levels of water stress treatment, i.e., 0 (control), -0.25，-0.5, -0.75, and -1.0 MPa, were planned by withholding irrigation for each crop. When considering relations of rice product ion with climatic variables, good agreement was observed between yield and total solar radiation. The rice yield increased with increasing total solar radiation. Similarly, heal summation also had significant effect on rice yield. The yield increased from 5.87 ton ha*1 at 2500.4 °C season'1 in the 2nd crop of 1992 to 7.51 ton ha1 at 2938.9 °C season'1 in the 1st crop of 1991. On the other hand， no significant difference in rice yield was found among total sunshine hours and rainfall. The rice yield dccreased with decreasing soil water potential at all levels of total solar radiation and heat summations. The results indicated that rice yield showed a linear relationship with soil water potential，for example, yield was decreased linearly up to -1.0 MPa for the 1st crop of and up to -0.75 MPa for the 2nd crop of 1992. Effect of water stress on yield was greater if stress was imposed at the panicle formation stage since significant yield reduction was shown in both crops.
本文硏究旨在探討不同生育時期土壤缺水對不同期作(1991-1993)水稻(Oryza sativa L. cv. Tainung 67)產量之影響，同時究明水稻產量與日照及積溫間之關係和其在缺水狀況下之變化。田間試驗係在臺灣省農業試驗所農場進行，土壤缺水處理乃以停止灌水方式達成，分爲0(對照）、-0.25、-0.5、-0.75、及-1.0 MPa等五種。根據試驗結果，正常灌水狀況之水稻產量與全期日射量呈現正相關，即水稻隨全期日射设增加而增產。水稻產量與全期累積氣溫亦顯示正相關，當全期累積氣溫從2500.4℃ season-1(1902年二期作)上升至 2938 °C season-1 (1991年一期作）時，產量自5.87 ton ha-1提高爲7.51 ton ha-1。當土壤水分不足時，水稻產量將因土壤缺水程度之增加而減產。在本文試驗期間，水稻產量之降低與水分潛勢呈現直線遞減關係。無論任何期作及年份，土壤缺水發生於穗形成期（幼穗分化期至抽穗）之嚴重性均較發生於營養生長期（分蘖盛期）爲大。
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