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Effects of some plant residues on nitrogen mineralization and biological activity in soils

The objective of this experiment was to determine the rate of decomposition and nitrogen mineralization of plant residues in soil under laboratory conditions. The experiment consisted of six treatments: control, industrial tobacco residues, rice straw, rice straw + mineral nitrogen, rice husks and rice husks+mineral nitrogen. | Turk J Agric For 24 (2000) 457–460 © TÜBİTAK Effects of Some Plant Residues on Nitrogen Mineralization and Biological Activity in Soils Emine Erman KARA Niğde University, Science-Education Faculty, Biology Department, 51100 Niğde-TURKEY Received: 16.06.1998 Abstract: The objective of this experiment was to determine the rate of decomposition and nitrogen mineralization of plant residues in soil under laboratory conditions. The experiment consisted of six treatments: control, industrial tobacco residues, rice straw, rice straw + mineral nitrogen, rice husks and rice husks+mineral nitrogen. The plant materials were added at a rate of 2000 mg/kgC and the amount of NH4+-N completed the C:N ratio of the added materials to 12.5. After adding the plant material the following measurements were carried out: soil respiration measurements 14 times, dehydrogenase activity 14 times, mineral nitrogen (ammonium and nitrate). The results show that the C:N ratio was found to affect the net mineralization and nitrogen mineralization under the present conditions for decomposition of plant residues. Mineral nitrogen addition is conducive for short-term decomposition when the C:N ratio is large. Bazı Bitki Hasat Artıklarının Toprağın Biyolojik Aktivitesi ve Azot Mineralizasyonuna Etkisi Özet: Laboratuvar koşullarında yürütülen bu çalışmada, bitki hasat artıklarının toprağın azot mineralizasyonuna, toprağın biyolojik aktivitesina olan etkilerini ve bitki hasat artıklarının topraktaki ayrışma oranını belirlemek amaçlanmıştır. Deneme; kontrol, tütün’ün fabrikasyon atığı, çeltik anızı+mineral azot, çeltik kavuzu ve çeltik kavuzu+mineral azot olmak üzere 6 uygulama şeklinde düzenlenmiştir. Bitki hasat artıkları toprağa 2000 mgC/kg toprak olacak şekilde, mineral azot ise toprağa ilave edilen bitki materyalinin C:N oranını 12.5 düzeyine getirecek şekilde hesaplanarak verilmiştir. Bitki hasat artıklarının toprağa karıştırılmasından sonra toprağa tarla kapasitesine getirilinceye kadar su .