Search Result of "percentage inhibition ability"

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Screening of Ethiopian Traditional Medicinal Herbs for their Nitrification Inhibiting Ability)

ผู้เขียน:ImgWassie Haile, Imgดร.ธงชัย มาลา, รองศาสตราจารย์, Imgนายยงยุทธ โอสถสภา, รองศาสตราจารย์, Imgนายวิสุทธิ์ วีรสาร, ผู้ช่วยศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Nitrification is the main cause of reduced N-use efficiency and yield of crops. Blending nitrogenous fertilizer with commercial or herb-based inhibitors is one of the means of increasing N-use efficiency. The objective of this study was to screen Ethiopian traditional medicinal herbs along with Neem (none traditional Ethiopian medicinal plant) and commercial inhibitors for their nitrification inhibiting ability. Soil samples were collected from Awassa Agricultural Research Center, Ethiopia. One hundred gram of processed soil was transferred to 250 ml capacity cups to which alcohol extracts of 11 herbs at 1% rate of dry soil were added separately. N-seve ([2-chloro-6 (trichloromethyl) pyridine]) and Dicyandiamide (DCD) were added at a rate of 2 and 100?g/g of soil respectively. The cups were also amended with 50 mg of ammonium sulphate and the moisture was maintained at 60% water holding capacity (WHC) and incubated for various period at 25?C. At the end of each period, samples were analyzed for pH, NH4-N and NO3-N. The result revealed that 72% of the tested herbs and commercial inhibitors conserved significantly high amount of NH4-N, an indication of inhibition of nitrification, at the end of 2nd week. But from among Ethiopian medicinal herbs, only Artemis afra, Echinops spp and Eugenia caryophyllata inhibited nitrification at the end of 3rd week. Averaged over two incubation periods, these herbs inhibited nitrification by 33, 37 and 64% respectively. Eugenia caryophyllata performed as effective as neem but none of the herbs out performed commercial inhibitors. Both medicinal herbs and commercial inhibitors prevented the soil from the acidification of the soil. There was a decline in inhibition percentage of all inhibitors with time but it was more drastic for herbs than commercial inhibitors. It is concluded that 3 Ethiopian medicinal herbs were identified as nitrification inhibitors. Thus, their extracts could be blended with ammonium fertilizers for increasing N-use efficiency of crops.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 040, Issue 1, Jan 06 - Mar 06, Page 74 - 82 |  PDF |  Page 

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Researcher

นาย วิสุทธิ์ วีรสาร, ผู้ช่วยศาสตราจารย์

ที่ทำงาน:ภาควิชาปฐพีวิทยา คณะเกษตร กำแพงแสน

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นาย ยงยุทธ โอสถสภา, รองศาสตราจารย์

ที่ทำงาน:ภาควิชาปฐพีวิทยา คณะเกษตร กำแพงแสน

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ดร. ธงชัย มาลา, รองศาสตราจารย์

ที่ทำงาน:ภาควิชาปฐพีวิทยา คณะเกษตร กำแพงแสน

สาขาที่สนใจ:จุลชีววิทยาของดิน (Soil microbiology ), ปุ๋ยชีวภาพ (biofertilizer )

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