Volume 19, Issue 7 (2017)
JAST 2017, 19(7): 1631-1645 |
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Ultra Jr. V U, Tan G M, Lau F U, Ponsalan M R O, Galo E A. Nutrient Availability and Biological Properties of Paddy Soils Under Rainfed Traditional “Payatak” Farming Systems in Catubig Valley, Philippines. JAST 2017; 19 (7) :1631-1645
URL: http://jast.modares.ac.ir/article-23-3439-en.html
URL: http://jast.modares.ac.ir/article-23-3439-en.html
1- Please change affiliation to: Botswana International University of Science and Technology, Palapye, Botswana.
2- University of Eastern Philippines-PRMC, Catubig, Northern Samar, Philippines 6418.
3- College of Agriculture, Fisheries and Natural Resources, University of Eastern Philippines, Catarman, Northern Samar, Philippines 6400.
2- University of Eastern Philippines-PRMC, Catubig, Northern Samar, Philippines 6418.
3- College of Agriculture, Fisheries and Natural Resources, University of Eastern Philippines, Catarman, Northern Samar, Philippines 6400.
Abstract: (3330 Views)
To understand the long-term effects of payatak and conventional rice farming system on soil properties and soil quality, a soil survey was conducted in existing “payatak” and conventional rice fields in Catubig Valley, Northern Samar, Philippines. Chemical analyses revealed that soils under “payatak” are more acidic, with low EC, OM, and N content compared to those soils from conventional rice farms. However, available P and exchangeable K in “payatak” soils were higher than those in conventional. The available N varied significantly with time and sampling area and the mineral N levels fluctuated greatly within three weeks after land preparation. The BiologEcoPlate™ and subsequent correlation analysis have shown a partial characterization of microbial functional community attributed to several factors leading to differences in chemical properties of the two rice farming systems. These results imply that the levels of OM and the amount of exchangeable K could trigger a distinct microbial community functional structure. Variations in soil pH, EC, and the amounts of nutrients have also caused a shift of the microbial functional diversity as represented by correlations between Shannon–Weaver indices. Overall, the results would indicate that long term “payatak” and conventional rice farming system would result in different soil nutrient status and distinct microbial functional community which may affect the overall productivity and soil quality. Further analysis should be done to establish the relationship between soil microbial properties data onto long term productivity in paddy soils.
Keywords: Available P, exchangeable base, microbial functional structure, N-mineralization, soil enzyme activities
Article Type: Research Paper |
Subject:
Soil Science
Received: 2015/11/23 | Accepted: 2017/03/18 | Published: 2017/12/1
Received: 2015/11/23 | Accepted: 2017/03/18 | Published: 2017/12/1
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