I= STUDIES ON DIFFERENT CROPPING SYSTEMS UNDER AGRO-CLIMATIC CONDITIONS OF DERA ISMAIL KHAN
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Title of Thesis
STUDIES ON DIFFERENT CROPPING SYSTEMS UNDER AGRO-CLIMATIC CONDITIONS OF DERA ISMAIL KHAN

Author(s)
Muhammad Sadiq
Institute/University/Department Details
Department of Agronomy/ Faculty of Agriculture / Gomal University, Dear Ismail Khan
Session
2008
Subject
Agronomy
Number of Pages
108
Keywords (Extracted from title, table of contents and abstract of thesis)
cropping systems, agro-climatic conditions, rice, wheat, cotton, legume crops, non-legume crops, berseem-rice, gram-rice

Abstract
In this research different cropping systems under agro-climatic conditions of D. I. Khan were studied, during 1995-1997 at Gomal University D.I. Khan. Randomized Complete Block (RCB) design was used in the experiment with 24 plots, replicated three times. The study revealed that yields and yield components of major field crops like rice, wheat, and cotton responded differently when followed after different legume and non-legume crops. There was a substantial increase in the parameters after legume based cropping systems than non-legume. During Summer 1995, yield and yield components of rice were not significantly influenced in various cropping systems and different locations. It was due to the reason that the .experiment was conducted on the fields where a wheat crop was harvested previously on both the locations. During Summer 1996, yield and yield components of rice were significantly affected in various cropping systems. Yield in rice was higher in Berseem-rice than gram-rice system while locations showed no significant effect on it. During winter 1995 -96, under different cropping systems, the plant height, number of tillers m-2,number of spikes m-2, and number of spikelets spike-1 in wheat differed significantly. These yield components were higher in legume based cropping system (Mung-wheat) compared to non legume (rice-wheat, and maize-wheat) systems. Among the non-legume systems, these parameters were reduced in maize-wheat system than rice-wheat system. Similarly, 1000-grain weight, biological yield and grain yield in wheat was significantly higher in legume based (Mung-wheat) cropping system. During Winter 1996-97, the yield and all other yield components except number of spikelets spike-1 were also significantly affected in wheat in different cropping systems. Comparatively the maximum plant height, number of tillers m-2, and number of spikes m-2 was achieved in green manure-wheat system followed by fallow-wheat system. Performance of wheat was better in rice-wheat than cotton-wheat system.

Overall the legume based system and fallow-wheat proved to be the best during this season. In case of cotton, all the yield components and yield was significantly increased in berseem-cotton than wheat-cotton system. Hundred seed weight in cotton was not significantly different in different cropping systems. Cropping systems under study showed negligible differences in nitrogen content of the soil. However, after the harvest of different crops in different phases of the study, the nitrogen contents of the soil increased progressively from initial N status of the soil due to the increase in cropping intensity. Similarly the differences in phosphorous content in the soil were also negligible. The little variations in phosphorous contents of the soil were probably due to the presence of higher quantities of clay in the soil which adsorbed the added soluble phosphorous.

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S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
279.01 KB
2 1 Introduction 1
166.07 KB
3 2 Review Of Literature 8
942.05 KB
4 3 Methods And Materials 37
290.82 KB
5 4 Results And Discussion 50
1185.09 KB
6 5 Summary And Conclusion 90
412.94 KB
7 6 Literature Cited 95
412.94 KB