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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Zinc Critical Levels and Supplying Powers of Takhli, Loei, and Khorat Soil Series for Corn Production) ผู้เขียน: ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ , Chiranee Vanichkul, Preeda Parkpian สื่อสิ่งพิมพ์:pdf AbstractPot experiments were conducted to examine critical levels and supplying powers of Zn in Takhli, Loei and Khorat soil series, as well as reliabilities of two methods of soil analysis, namely, extraction with 0.1 NHCl and extraction with DTPA (pH 7.3). Results showed that Takhli soil was so severely deficient in Zn that Zn visual deficiency symptoms were observed whereas Loei soil was Zn-deficient but not so severely that visual deficiency symptoms could be observed. Khorat soil series was estimated to be able to support corn production for at least 37 years before it needed Zn application for maximum growth. Narrowest ranges of extracted Zn that covered critical levels for Takhli, Loei and Khorat soil series were 2.5-4.8, 9.6-13.9 and 6.9-16.0 ppm, respectively when extracted with 0.1 NHCl and were 1.2-2.0, 8.6-12.6 and 3.4-12.4 ppm, respectively when extracted with DTPA. Considering the three soils as one group, the narrowest ranges were 4.8-9.6 and 2.0-8.6 ppm for extractions with 0.1 NHCl and with DTPA, respectively. Narrowest ranges of Zn concentrations in corn plants were 18-32, 50-57 and 52-107 ppm for Takhli, Loei, and Khorat soil series, respectively. Considering the three soils as one group, the narrowest range of Zn in plants was 32-52 ppm. It was concluded that extraction with 0.1 NHCl gave slightly more reliable prediction than extraction with DTPA. However, differences in critical levels found for the individual soils suggested that Zn concentration in plants would provide more reliable prediction than amounts of Zn extracted from soils by the two methods. Takhli and Loei soil series needed 6.3 and 43.8 kg Zn/ha to produce maximum growth of corn plants. However, 62.5 kg Zn/ha applied to the three soils was not toxic to corn. |
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 Researcherดร. ประพันธ์ศักดิ์ ศีรษะภูมิ, รองศาสตราจารย์ที่ทำงาน:ภาควิชาเพาะเลี้ยงสัตว์น้ำ คณะประมง สาขาที่สนใจ:การใช้ยาและสารเคมีในการเพาะเลี้ยงสัตว์น้ำ, โรคและการวินิจฉัยโรคในสัตว์น้ำ, ระบบภูมิคุ้มกันของสัตว์น้ำและชีววิทยาโมเลกุลของยีนที่เกี่ยวข้องกับระบบภูมิคุ้มกันในสัตว์น้ำ Resume |
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Harvesting Indices of Strawberries in Thailand) ผู้เขียน: K. Vanichkul, S. Kosiyachinda, M. Kosittrakul, S. Ketsa, V. Vangnai, P. Tong Umpai สื่อสิ่งพิมพ์:pdf AbstractTioga strawberries of 4 different-colored stages were harvested from Intonon area in the cooler month of December. 1982. Their quality criteria were determined right after sorting at the lntanon Station. The remaining berries were air-shipped to lab in Bangkok for study at daily interval. Another batch of different stages of berries similar to the December crop was studied in the warmer month of March, 1983. It was found that after harvest all strawberries developed color rapidly. those of 21 -40% red color when harvested deloped color to an acceptable condition of over 90%) color within 2 days. The March crop had a slightly faster rate of color development, it is faster than the December crop by approximately half a day. More advanced stage of strawberries. the 61-80% colerl in the December harvest had higher SS than others by only 1 .O'%. Those of March had slightly lower SS than the December by about 0.5% The younger stage of 0-20% color strawberries tended to have higher acid content than other stages in the cooler month crop. Their difference in this respect between the two months was less than 0.0:3% in favor of the hotter month. The SS/ TA ratios of the cooler month strawberries are higher than those of the warmer month by lo;. It is suggested along the support of organoleptic evaluation that strawberries of above 41% color of either months possessed acceptable eating quality right after harvest. The younger stage of 21-40% color needed 3 days after harvest to attain such quality. Strawberries are firmer in the younger stages. They also had greater firmness in the cool month crop. Four days after harvest fruit firmness of the cool and hot month crops was different by 0.55 to 0.86 kg/cm2. Weight losses increased in relation with time. On the third day after harvest. the losses amounted to 6% for the December crop. while that for the warmer month was 9%. The apparent losses were fruit losses due to mechanical and biological injuries. The former factor played a bigger role due to human problems which could be alleviated with "Tender Loving Care" practices. |
 หัวเรื่อง:ระดับวิกฤตและความสามารถในการให้ธาตุทองแดงของชุดดิน ตาคลี เลย และโคราช สำหรับการผลิตข้าวโพด ผู้เขียน: Chiranee Vanichkul, ดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ , Preeda Parkpian สื่อสิ่งพิมพ์:pdf AbstractPot experiments were conducted to examine critical levels and supplying powers of Cu in Takhli, Loei and Khorat soil series, as well as reliabilities of two methods of soil analysis, i.e., extraction with 0.1 NHCI and extraction with DTPA. Samples of the three soils were applied with different rates of CuCl2 and then repeatedly cropped with corn in small pots until a difference in corn dry matter was found between Treatments receiving different rates of Cu. Soil samples were taken before each cropping for analyses of available Cu by the two analytical methods mentioned above. Results showed that the three soils were not deficient in Cu. However, copper status of Takhli and Khorat soils were close to the critical levels. It was estimated that annual corn cropping could be practiced for at least 5, 37 and 2 years on Takhli, Loei, and Khorat soils, respectively before response of corn to Cu application could be obtained. Narrowest ranges of extracted Cu that covered critical levels for Takhli, Loei and Khorat soils were 0.40 - 0.45, 1.05 - 1.30 and 0.25 - 0.35 ppm, respectively when extracted with 0.1 N HC1 and were 3.0 - 3.3, 2.4 - 2.7 and 0.8 - 0.9 ppm, respectively when extracted with DTPA. Considering the three soils as one group, the narrowest ranges were 0.35 - 1.05 and 0.9 - 3.0 ppm for extractions with 0.1 NHCI and with DTPA, respectively. Narrowest ranges of Cu concentrations in corn plants were 5.6 - 6.8, 4.7 - 4.7 and 3.5 - 3.7 ppm for Takhli, Loei, and Khorat soils, respectively. Considering the three soils as one group, the narrowest range of Cu in plants was 3.7 - 5.6 ppm. It was concluded that extraction with 0.1 NHCI gave more reliable prediction than extraction with DTPA. However, differences in critical levels found for each soil suggested that Cu concentration in plants would provide more reliable prediction than amounts of Cu extracted from soils by the two methods. |