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All Journal Jurnal Planta Tropika
Keitaro Tawaraya
Faculty of Agriculture, Yamagata University, Japan; The United Graduate School of Agricultural Sciences, Iwate University, Japan
Agriculture, Biological Sciences & Forestry

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Weeding Frequencies Improve Soil Available Nitrogen in Organic Paddy Field Margi Asih Maimunah; Valensi Kautsar; Putu Oki Bimantara; Samuel Munyaka Kimani; Asih Indah Utami; Riza Kurnia Sabri; Keitaro Tawaraya; Sri Nuryani Hidayah Utami; Benito Heru Purwanto; Weiguo Cheng
PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) Vol 10, No 1 (2022)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v10i1.12707

Abstract

Appropriate weeds control is needed against weeds constraints in field, especially the organic field. With the appropriate management, weeding would benefit the organic field not only in reducing weeds but also in increasing nitrogen (N) availability in organic rice fields. This research aims to observe soil available N changes affected by weeding frequencies in organic paddy fields. Treatments applied were five weeding frequencies (WF) such as 0 WF, 2 WF, 4 WF, 6 WF, and 8 WF, to study the effect of various weeding frequencies on soil total N and available N ( NH4+ and NO3–) in the organic rice field. The soil in the conventional field was analyzed as a comparison to organic field soil. The results showed that soil C and N contents are similar in all treatments. Meanwhile, 6 WF performed the highest soil  NH4+ among organic plots (10.36 mg N kg–1) and 8 WF enhanced soil NO3– to the highest average among all plots (10.12 mg N kg–1). The treatment of 6 WF and 8 WF also maintain the increase of soil  NH4+ to 51 days after transplanting (DAT), meanwhile 0 WF, 2 WF, and 4 WF decreased after 40 DAT. Water samples from fields inlet-outlet and river showed that  NH4+ content found in water sample was higher than NO3–. We concluded that the more frequencies of weeding applied to organic fields potentially preserved soil inorganic N longer, which is very important in supporting rice growth. 
Co-Authors Asih Indah Utami Benito Heru Purwanto Margi Asih Maimunah Putu Oki Bimantara Riza Kurnia Sabri Samuel Munyaka Kimani Sri Nuryani Hidayah Utami Valensi Kautsar Weiguo Cheng