Organic matter and nitrogen returns to soil by different cropping systems rotations on a vertisol in the Indian semi-arid tropics

Abdurahman, M D S (1996) Organic matter and nitrogen returns to soil by different cropping systems rotations on a vertisol in the Indian semi-arid tropics. PHD thesis, Acharya N G Ranga Agricultural University.

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Supervisors NameSupervisors ID
Bhaskar Reddy, BANGRAU
Renard, CUCL-Ecologie des Grandes Cultures
Safyanarayan, VANGRAU


Organic matter plays an important role in soil management and crop production: It is the natural source of mineral N. The results of the experiments carried out show the importance of quantifying the organic matter inputs to the soil by different cropping systems rotations. The results show that in the absence of N fertilizers, S/PP S/PP can deposit in the soil a substantial (2395 kg ha-') amount of root organic matter on the other hand the non-leguminous system StSAF S+SAF contribute 1652 kg ha1 of root organic matter to the soil. But if the crops are given adequate N fertilizer the results show that almost similar mounts of root can be deposited even by the non-leguminous system. The sane findings were observed in the case of N content of the roots deposited to the soil by the different crops in the different systems. Legumes can also contribute to the organic matter of the soil by way of fallen dry leaves, which if incorporated into the soil mineralize and conitributes ubstantial amounts of N.

Item Type: Thesis (PHD)
Subjects: Others > Soil Science
Depositing User: Users 6 not found.
Date Deposited: 30 Aug 2011 05:11
Last Modified: 30 Aug 2011 05:11
Acknowledgement: I would like to express my sincere thanks to Dr. B. Bhaskar Reddy Professor and Head (VC), Department of Agronomy, college of Agriculture, Hyderabad (ANGRAU) and Chairman of the advisory committee for his guidance and encouragement throughout my study at ANGRAU. He taught me how to always be the best student. It gives me immense pleasure in extending my deep sense of gratitude to Dr. Charles Renard, Professor Ecologie des Grandes Cultures, UniversitC Catholique de Louvain, Co-chairman of my advisory committee for his valuable counsel and meticulous guidance. Dr. Charles was always available when I needed his help for my work and for Iny personal Me. My family and I will never forget your continuos support. I would also like to thank Dr. T.J Rego Sr. Scientist, Soils and Agroclimatology Division (SACD) for his ideas and useful comments towards the research component of my studies. He never hesitated to share with me his vast experience. I certainly learned a lot from him. My sincere thanks to Dr. Bjorn Seeling, Research Fallow, (SACD) for unreserved guidance and support throughout the course of this study. Owing to his red pen, this manuscript was straightened and one of my wishes came true. Thank you Dr. Seeling. I extend Iny sincere thanks to Dr. P.S. Sar~iiaP rofessor and Head (IIC), Department of Plant Physiology, college of Agriculture. Hyderabad (AXGRAU) arid Dr. V. Satyanarayana, assistant controller exalninations, members of my advisory committee for their help during rny study at ANGRAU. I am grateful to Dr. R.J.K. Myers, Director, Soils and Agrocbnatology Division (SACD) for keen interest, constructive criticism and invaluable suggestions during thesis writing. Special thanks to Dr. J.G. Ryan, Director General (DG), ICRISAT; Dr. Y.L. Nene, Deputy DG, ICRISAT, Dr. Karl Harmsen, Regional Executive Director, ICRlSAT Sahelian Center, Dr. B. Diwakar, Acting Programme Leader, Training and Fellowships Programme for their help in getting the scholarship and most importantly for helping n7e reunite with my family. Thanks to you all, without your help and support I would not have achieved this today. The generous help of rnany people during my research work must be noted. The work described here would not be as substantive as it is without the help of following people: M. Mohan Rao, T. Gopal Chary, P. Balwanth Reddy, and Yadiah, thanks to you all for your continuos help and Support during field work. I will never forget those hot sunny days or rainy and cold days that we worked together in the field harmneri~igd own soil tubes. Thanks to G. Ravi Kumar and Mrs. J. Jayanani for their help in aialysing plant samples and K.V.S. Murthy, O.P. Balakrishnan and J.Koteshwar Rao for analysiig soil samples. Thanks to Mr. V. Nageswara Rao and Mr. G. Pardhasaradhi for their day to day support and suggestions. Thanks to Mrs. R.S. Sirisha for providing the necessary supplies and stationaries for field use and thesis writing. 1 appreciate the work of SACD-Soil Chemistry, regular work force (RWF). Swamy, Shankaraiah, Pushpam, Swaroopa, Kamalammaa nd Danrunmna. Thanks to you all for your help during plant growth sampling and processing.
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