Levels of fertilizers 48 



Experimental design 51 



Data collection ^1 



Soil sampling and chemical analyses 52 



Statistical analysis of data 52 



Results and Discussion 53 



Shifts in Soil Properties 53 



Total soluble salts 53 



Soil reaction 53 



Soil organic matter 35 



Soil nitrogen 3^ 



Soil potassiijm 59 



Effects of Crop aind Fertilizer Management 



Levels on Marketable Yields 59 



Cropping pattern HM-HM-HM 59 



Cropping pattern JM-U1-IM 61 



Cropping pattern HM-MM-IiM 61 



Cropping pattern HM-LM-MM 61 



Resource Utilization of Cropping Patterns 63 



Labor profile 63 



Production costs 63 



Income and Returns to Production Inputs 65 



Gross and net income 65 



Returns to production inputs 68 



Rates of return to production Inputs 68 



Economic Implications 72 



SUMMARY AND CONCLUSIONS ?4 



LITERATURE CITED 81 



BIOGRAPHICAL SKETCH 96 



VI 



