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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Phosphates and Salt on Yield and Quality of Cooked White Shrimp (Penaeus vannamei)) ผู้เขียน: จรวย ไฝทอง,  ดร.นงนุช รักสกุลไทย, รองศาสตราจารย์ , นางมยุรี จัยวัฒน์, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe effects of phosphates; namely tetra sodium pyrophosphate (TSPP), sodium tripolyphosphate (STPP) and sodium hexametaphosphate (SHMP), on the quality of cooked white shrimp (Penaeus vannamei) were studied. Compared to the control, concentration of phosphates and immersion time significantly affected the weight gained of raw shrimp and cooking weight loss of cooked shrimp (p? 0.05). The results on the effects of immersing the shrimp in 2 % TSPP for 8 h were similar to those in 2 % STPP for 10 h; while the immersion in 3 % SHMP for 10 h was less effective. Apparently, the addition of 1-3 % sodium chloride increased the weight gained in all raw samples immersed in different phosphates solution. Nevertheless, STPP showed a synergistic effect with salt on reducing the cooking weight loss. The combined effect of 2 % salt and all types of phosphates yielded a good quality cooked shrimp with high acceptability. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Fresh and Residual Calcined Phosphates on Flooded Rice in Acid Sulfate soils) ผู้เขียน:นายปิยะ ดวงพัตรา, ศาสตราจารย์, Paiboon Prabhuddham, Chairerk Suwannara สื่อสิ่งพิมพ์:pdf AbstractPot and field experiments were conducted during the wet seasons 1985 and 1987 to evaluate the relative effectiveness of a calcined phosphate fertilizer, Phospal-34 (PP-34), on flooded rice in acid sulfate soils. The experiments comprised 1) 2 consecutive pot trials and 3 consecutive field trials to assess the effects on rice of fresh and residual P from 2 sources, PP-34 and Monoammonium phosphate (MAP) and 4 rates of fertilizer phosphorus and 2) 2 consecutive field trials to investigate the effects on rice of fresh and residual P from fertilizers containing PP-34. Rice grown on acid sulfate soils in both pot and field experiments showed marked response to fresh and residual phosphates applied either in the form of PP-34 or MAP. In 3 consecutive field trials, the response to residual phosphate of the second rice crop was the highest. Averaging from the 3 crops, grain yield increase due to the added-P was about 30 percent. The effectiveness of fresh and residual PP-34 were comparable to those of P containing in Monoammonium phosphate. As a straight P fertilizer, PP-34 can be used for flooded rice in acid sulfate soils as an alternative source to highly water-soluble P fertilizer, MAP. Moreover, for the formulation of mixed fertilizers for rice, a fertilizer containing 40% available P derived from PP-34 and 60% deriving from Diammonium phosphate (DAP) was as agronomically effective as DAP. It is probable that PP-34 can be used to partially substitute other highly water-soluble P materials in the mixed fertilizer produce. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Primary and residual Effects of Rock Phosphates and Their Correlation with P-Test Value of Rice Soil ) ผู้เขียน:Piya Duanpatra, Laddawan Koamtong สื่อสิ่งพิมพ์:pdf AbstractTwo consecutive pot experiments were conducted to study the primary and residual effects of rock phosphate fertilizer from 6 different origins on lowland rice. Four commonly used methods for determining “ available” phosphors in soil were also used to evaluate their effectiveness in phosphorus in soil were also used to evaluate their effectiveness in predicting the response of rice to the phosphate fertilizers. The rice plant responded markedly and significantly in terms of straw yield, phosphorus concentration of straw and total phosphorus uptake in straw to the rock phosphate fertilizers in both plantings. Highest responses were obtained with the Horth Carolina rock phosphate while lowest responses were obtained with the Missouri rock phosphate. Straw yield, phosphorus content of straw and total phophorus content of the soil as determined by the Bray I and Olsen method. The Bray II and Truog methods also gave P-test values that show significant correlation with the responses of the rice plant but the correlations were not as pronounced as those obtained with the Bray I and Olsen methods. The correlation coefficients obtained with the four methods of phosphorus determination rank as folows – Bray I >Olsen>Bray II>Truog. |
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