 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Changes in Leaf Orientation and Canopy structure of Cotton (Gossypium hirsutum L.) under Different Plant Population Densities) ผู้เขียน: ดร.ศรปราชญ์ ธไนศวรรยางกูร, รองศาสตราจารย์ ,  Herve Sinoquet, Eric Jallas, Michel Cretenet สื่อสิ่งพิมพ์:pdf AbstractThe effects of plant population density on diurnal changes of leaf orientation behavior and canopy structure of cotton (Gossypium hirsutum L.) during growing season were studied under field conditions by using an electromagnetic digitizing system for characterizing the canopy structure. At high density (80x9 cm-138,890 plants/ha), leaf area index (LAI) developed more rapidly than medium density (80x18 cm-69,440 plants/ha) and low density (80x40 cm-31,250 plants/ha), respectively, due to a greater number of leaves per plant. At the same plant age, plant characteristics, except leaf area plant and leaf area expansion rate (LAER), of high-density canopy differed from medium-density canopy while those expect leaf size differed from low-density canopy. Medium–density canopy did not show significant difference of plant characteristics compared to the low-density canopy, except leaf size and number of leaves per m2. At the same LAI stage, the cotton plants under high density had different plant characteristics, except leaf size and number of leaves per m2, from those under medium density. However, the plant characteristics, except internode length and number of leaves per m2, of high – and medium- density canopies did not differ significantly from low-density canopy. Leaf orientation behavior did not differ significantly between plant densities, particularly at the same stage of LAI. Cotton leaves tended to face the sun more at noon than in the morning and in the afternoon during growing season. Changes in horizontal and vertical distributions of leaf area were not significantly altered during the day by diurnal leaf orientation, but they differed significantly during growing season. These changes were significantly different between the three plant population densities at the same plant age. However, there were no significant differences in horizontal and vertical leaf area distribution at the same stage of LAI among the three plant population densities. This quantitative description of canopy structure may be useful for developing mathematical models of light interception in the canopy of cotton. |
หัวเรื่อง:การตอบสนองของพันธุ์ถั่วเขียวผิวมันและถั่วเขียวผิวดำต่อฤดูปลูกและอัตราปลูก ผู้เขียน:Aphiphon Pookpakdi, Harisadee Pataradilok สื่อสิ่งพิมพ์:pdf AbstractTwo sets of plant population vs planting date study were conducted at Kamphaeng Saen Campus of Kasetsart University, Nakorn Pathom province in Thailand, using two genotypes each of mungbean, Chainat 60 and U-thong 1; and black-gram, U-thong 2 and DM 24 in a split plot experiment with three replications. Main plots composed of three series of planting seasons, dry 1989, wet 1989 and dry 1990 while sub plots composed of three plant populations, viz 200,00 ; 400,000 and 800,000 plants per hectare and two genotypes per species ar?ranged in factorial combination within the main plot. It was found that, The yield of blackgram could be further increased when plant population increased from 200,000 to 800,000 plant, ha-1 . In mungbean cv. Chainat 60, yield increases was also found when plant population increased, however, for U-thong 1, the increase in yield as the result of increasing plant population was not obvious. |
หัวเรื่อง:ความแตกต่างของผลผลิตและการเจริญเติบโตของถั่วเหลืองพันธุ์ ส.จ.4 เมื่อปลูกในพื้นที่ปลูกขอนแก่น และกำแพงแสน โดยให้มีฤดูปลูกและอัตราปลูกต่างกัน ผู้เขียน:ดร.อภิพรรณ พุกภักดี, ศาสตราจารย์ , Harisadee Pataradilok, Suwit Laohasiriwong, Adisak Suwitawatch สื่อสิ่งพิมพ์:pdf AbstractThe study on growth, yield production and cultural practices suitable for soybean (Glycine max (L.) Merrill) cultivar S.J.4 was conducted between 1987-1991. This study presented a collaborative effort between Department of Agronomy, Kasetsart University and Department of Plant Science, Khon Kaen University. The objective of this study was to establish data-base of certain Thai soybean cultivar and its response to environments and cultural practices of the new production areas in the northeast and central plain in which Khon Kaen and Nakorn Pathom provinces were the representatives. In the serial sowing date experiments in which soybean cv. S.J.4 were planted at one month interval in 1987-88, it was shown that soybean cultivar S.J.4 responded similarly to temperature both at Khon Kaen and Kamphaeng Saen. At Khon Kaen, the effect of temperature was more pronounced than those planted at Kamphaeng Saen. On the average, S.J.4 soybean flowered earlier at Khon Kaen and maturity date was shorter at Khon Kaen than at Kamphaeng Saen, therefore dry matter and seed yields per plant of soybeans grown at Kamphaeng Saen were generally higher than those planted at Khon Kaen. It was also indicated that planting soybeans at Khon Kaen in early rainy season would result in high yield production. While, at Kamphaeng Saen, the yield obtained from soybeans planted after rice were higher than those planted in the rainy season. Increasing plant population densities from 200,000 to 800,000 plant. ha-1 would result in the increase in dry matter and seed yield per area of S.J.4 soybean grown at Kamphaeng Saen and Khon Kaen. There was only slight difference in dry matter yield per area obtained from various plant population treatments used at Kamphaeng Saen. However, the dry matter yield at Khon Kaen was higher in early rainy season than in the dry season due to favorable moisture, relative humidity, and night temperature at Khon Kaen. It can be concluded that planting soybean both at Khon Kaen and Kamphaeng Saen using high plant densities resulted in higher seed yield in early rainy than in the dry season. However, the yield difference between both seasons was greater at Khon Kaen than those found at Kamphaeng Saen. |
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