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No.27 (1980/11) >

 
Title :サトウキビのカンガイにおける有効土壌水分の下限値について (3) (農業工学科)
Title alternative :On the lowest limit of available soil moisture in irrigation for sugarcane (Department of Agricultural Engineering)
Authors :山城, 三郎
吉永, 安俊
Authors alternative :Yamashiro, Saburo
Yoshinaga, Anshun
Issue Date :29-Nov-1980
Abstract :1.本研究はポット試験によって, サトウキビのカンガイにおける有効土壌水分の下限値について検討するものである。2.上記の目的を達成するために, 本年度はサトウキビを植え付けた78個のポットを13のグループに分け, 各グループにおけるポットの土壌水分をそれぞれpF1.9,pF2.3,pF2.7,pF3.0,pF3.3,pF3.4,pF3.5,pF3.6,pf3.7,pF3.8,pF3.9,pF4.0,pF4.2に対応するように制御してサトウキビの平均日蒸散量および生育状況とこれらのpF値との関係を調べた。また各pF区におけるサトウキビの平均日蒸散量と気温, 日射量および蒸発計蒸発量との関係を調べ, その面からも有効土壌水分の下限値について検討した。3.各pF区における平均日蒸散量と気温, 日射量および蒸発計蒸発量との関係はそれぞれ直線で示された。平均日蒸散量, 平均日蒸散量とこれらの気象要因との関係直線の勾配, サトウキビの茎長, 茎径および乾物重量はpF3.5あたりまではpF値の増大に伴い緩やかに減小し, その後は急減する傾向を示した。しかし, サトウキビの草丈とpF値との関係は負の勾配を持つ直線で示された。4.サトウキビのカンガイにおける有効土壌水分の下限値としては約pF3.5に対応する土壌水分が適当であると推察される。
1. This study was done in order to investigate on the lowest limit of available soil moisture in irrigation for sugarcane. The sugarcane which was used in this test was planted in pots. 2. To attain this purpose, the seventy eight pots in which the sugarcane was planted were divided into thirteen groups and soil moisture of the pots in each groups was controlled at pF1.9,pF2.3,pF2.7,pF3.0,pF3.3,pF3.4,pF3.5,pF3.6,pF3.7,pF3.8,pF3.9,pF4.0 and pF4.2 respectively. We investigated the relationship between average daily transpiration, growth of the sugarcane and the values of pF. We also investigated the relationship between average daily transpiration in each groups and temperature, solar radiation and pan evaporation respectively and we considered on the lowest limit of available soil moisture also from this side. 3. The relationship between average daily transpiration and temperture, solar radiation and pan evaporation showed linear equation respectively. The average daily transpiration, the gradients of the linear equations on the relationship between the average daily transpiration and these meterological factors, stem length, stem diameter and dry weight of the sugarcane decreased slowly until about pF3.5,but quickly after that for the increase of the values of pF. But the relationship between plant length of the sugarcane and the values of pF showed linear equation with negative gradient. 4. It seems that the soil moisture at about pF3.5 may be suitable for the lowest limit of available soil moisture in irrigation for sugarcane.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4100
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.27 p.203 -211
Appears in Collections:No.27 (1980/11)

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