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 ที่มา:มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:การพัฒนาเครื่องหมายโมเลกุลของลักษณะต้านทานต่อโรคราเขม่าดำในหญ้ากินนี |
 หัวเรื่อง:ผลของเวลาเก็บเกี่ยวที่มีต่อผลผลิตและคุณภาพของเมล็ดพันธุ์หญ้ากินนี ผู้เขียน: นางสุนันทา จันทกูล, ผู้ช่วยศาสตราจารย์ , นายสนั่น จันทร์คำ, ดร.สายัณห์ ทัดศรี, ศาสตราจารย์ ,  Pranee Khantongchai สื่อสิ่งพิมพ์:pdf AbstractThe experiment was conducted at Kampangsaen Campus Kasetsart University in wet and dry season of 1985 in order to determine the effect of harvesting times on seed yield and quality of quinea grass. The inflorescences were harvested from each plot at 10, 14, 18, 22 and 26 days after panicle emergence. The results showed variation in both yield and quality of seed harvested at different ages and seasons. Maximum seed yield (631 kg/ha) was obtained from panicles harvested in the wet season at 18 days after panicle emergence while the dry season harvest was peaked at day 10(341 kg/ha). Pure seed yield was highest at 26 days harvest in the wet season (266 kg/ha) and was lowest at the 22 days harvest in the dry season (174 kg/ha). However, seed quality was found increased with the increasing age of panicle. |
หัวเรื่อง:อิทธิพลของชนิดและอัตราปุ๋ยไนโตรเจนที่มีต่อผลผลิตของหญ้ากินนีที่ปลูกบนชุดดินกำแพงแสนในสภาพไร่นา ผู้เขียน:Prasert Bunpithukkeit สื่อสิ่งพิมพ์:pdf AbstractA field experiment was established to determine the influence of nitrogen sources and nitrogen rates on the dry matter production of Guinea grass grown on Kamphaeng Saen soil series (Typic Haplustalp five silty, mixed). The experiment was conducted at experimental farm of the Department of Soil Science, (Kamphaeng Saen campus), Kasetsart University, Nakorn Pathom. In 1989, a factorial experiment in randomized complete block design of three nitrogen sources, urea (46% N), ammonium sulfate (21% N) and ammonium chloride (25% N) While rates of nitrogen were 0, 25, 50 and 75 kg N/rai with 3 replications. The grass was harvested for analysis every month and these analysis have carried out for six months. The average of dry matter yields and N yields of Guinea grass showed no significant difference from various nitrogen fertilizers. The ammonium sulfate application gave the highest average dry matter of 2,230 kg/rai. On the other hand, the highest N yields was 33.04 kg/rai when applied ammonium chloride. The yields of Guinea grass increased with increasing level of nitrogen fertilizer application. Average dry matter production of Guinea grass obtained from different rate of nitrogen fertilizer were significant difference and at 75 kg N/rai, the highest dry matter yields and N yields were 2,720 and 45.86 kg N/rai, respectively. The recovery of nitrogen was between 38% to 45%. The highest nitrogen recovery was 45% from ammonium chloride, following by urea 43%, While the lowest one was about 38% from ammonium sulfate. |
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หัวเรื่อง:การใช้น้ำทิ้งจากการผลิตแก๊สชีวภาพเป็นปุ๋ยไนโตรเจนสำหรับหญ้ากินนี ที่ปลูกบนดินกำแพงแสน ผู้เขียน:ดร.ศุภมาศ พนิชศักดิ์พัฒนา, ศาสตราจารย์เกียรติคุณ สื่อสิ่งพิมพ์:pdf AbstractEffluent from biogas production (EFB) of liquid swine wastes was tested as nitrogen source and as irrigational water for guinea grass planted in Kamphaeng Saen soil. The EFB was applied weekly at 40,000 l/rai (6.25 rai = 1 ha) for the whole growing period. With the mentioned rate, the EFB supplied nitrogen for the grass which was equivalent to 25 kg N/rai (156 kg N/ha). Inorganic fertilizer (IF) in the form of ammonium sulfate at the same rate as above was used as the standard treatment. Combination of the two treatments (1/2EFB + 1/2IF) and no nitrogen fertilizer (Ch) were set as an alternative and the check treatments, respectively. The experiment was conducted as field trial using RCBD with 4 replications. One crop of the grass was harvested 4 times monthly. The grass was planted for the total of 3 consecutive dry seasons. The results indicated that by using EFB, grass yield could be produced as much as using 25 kg N/rai chemical fertilizer. The grasses which received EFB or IF were more or less the same in nutrient amount and nutritional quality. The EFB could replace irrigational water for the whole planting period. It could substitute irrigational water as much as 160,000 l/rai/month (1,000,000 l/ha/month). With long-term application of the EFB, there were no change of Zn, Cu, pH and electrical conductivity of the soil. Some soil physical properties, such as state of aggregation, were likely improved. In addition, no increase of nitrate content in ground water was observed. |
หัวเรื่อง:อิทธิพลของระยะเวลาในการขาดน้ำต่อปริมาณโพรลีนและคุณภาพของหญ้ากินนี ผู้เขียน:ดร.นวรัตน์ อุดมประเสริฐ, รองศาสตราจารย์ , Suwapong Sawasdiphanich สื่อสิ่งพิมพ์:pdf AbstractThe effects of the duration of water stress on forage quality of purple guinea (Panicum maximum Jacq.) were determined by using the accumulation of praline content during water stress as and indicator for drought tolerance. The plants were subjected to water stress for 10, 15 and 20 days before praline, protein, and acid-detergent fiber analyses. It was found that protein content of guinea grass decreased under the short period of water stress condition, but increased then the stress was prolonged. Protein content was similar to the control when plants were subjected to water for 20 days. Acid-detergent fiber increased under water stress condition. However, different durations of water stress had no effect on the quantity of acid-detergent fiber. Proline content increased as the duration of water stress increased. The results suggested that purple guinea tends to acclimate to drought as considering from the change in its proline and protein contents. |
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