Search Result of "Piya Chalermglin"

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study on the maturation of pineapple. (Ananas comosus L.) I. Method of applying ethephon for hastening fruit maturation.)

ผู้เขียน:ImgPiya Chalermglin, Imgดร.สุรนันต์ สุภัทรพันธุ์, ศาสตราจารย์, Imgมล.จารุพันธ์ ทองแถม, รองศาสตราจารย์, ImgPirat Teeravuthichai

สื่อสิ่งพิมพ์:pdf

Abstract

The study of using ethephon (2-chloroethane phosphonic acid) at 0, 3,000 and 6,000 ppm sprayed around the fruits compared with dipping the chemical into the crowns, was conducted at Don Khun Huai district, Petchburi province from October 1977 to April 1978. It was shown that ethephon can hasten the harvesting time of the fruits compared to the control treatment. The maturity response was more pronounced when the chemical was sprayed around the fruits and this was seen in all concentrations under investigation. The implication of this method of hastened harvesting for the pineapple industry was discussed,

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 014, Issue 1, Jan 80 - Jun 80, Page 8 - 13 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:สมการคำนวณอัตราปุ๋ยไนโตรเจนสำหรับข้าวโพดจาการวิเคราะห์ดิน

ผู้เขียน:Imgดร.อำนาจ สุวรรณฤทธิ์, ศาสตราจารย์เกียรติคุณ, ImgPiya Chalermglin, ImgJarong Rungchaung

สื่อสิ่งพิมพ์:pdf

Abstract

Comparisons were made among reliability of 9 chemical methods for evaluating the availability to maize of N in soils and for calculating N-fertilizer rates that would produce high maize yields while minimize N fertilizer and gave no detrimental environmental effects. The methods studied were: (1) measuring soil organic matter by Walkley and Black’s method, (2) measuring total soil N by Kjeldahl’s method, (3) extracting soil N with acidified K2CrO7 solution, (4) extracting soil N with basified KMnO4 solution, (5) extraction soil N with acidified KMn O4 solution, (6) extraction soil N with a solution of CaCl2 and K2SO4, (7) extracting soil nitrate according to Keeney and Nelson (1982) and then measuring the extracted nitrate by Kjeldahl method, (8) extracting soil nitrate according to Iversen et al. (1985) and then measuring the extracted nitrate with nitrate specific electrode and (9) measuring nitrate in maize shoots at 1 month of plant age. The study was made with field-plot experiments at 20 sites using Suwan-3 maize. Four methods, namely methods (1), (2), (7) and (8) were found superior to the others. The equations for calculating rates of N for maize from these methods were: (a) log (100 – y) = 2 – 0.347 b – 0.0377 x for method (1), (b) log (100 – y) = 2 – 0.000593 b – 0.0298 x for method (2), (c) log (100 – y) = 2 – 0.0389 b – 0.0326 x for method (7) and (d) log (100 – y) = 2 – 0.0432 b – 0.0238 x for method (8); where y was the obtained grain yield in percent of the maximum yield; b, the index of soil-N availability [as % of soil organic matter for method (1) and ppm N for methods (2), (7) and (8)] and x, rate of the required fertilizer N in kg N per rai(6.25 rais = 1 ha). Considering with other factors in conjunction to the reliability, methods (1) and (8) were recommended.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 029, Issue 3, Jul 95 - Sep 95, Page 345 - 357 |  PDF |  Page