78 

 fertilizer treatments were hi^er than applied K indicating that K ferti- 

 lizer is less limiting compared to N fertilizer in sequential cropping. 



The overall effects of fertilizer levels on marketable yields of 

 vegetable crops in four cropping patterns indicated that more responses 

 were observed on first crops than on second and third crops. Differences 

 in yield responses due to fertilizer levels were not consistent T-dth 

 differences in soil test values for N and K. Improved yields of crops 

 in foi;ir cropping patterns were achieved at medium fertilizer level 

 although most yields obtained from this level were not significantly 

 hi^er than yields at low fertilizer level. Application of high ferti- 

 lizer rate beyond the medium level resulted in no additional yield 

 increase for most crops. 



Labor requirement and total production costs were significantly 

 higher in cropping pattern HM-HM-HM than IM-LM-LM, HM-MM-LM, and HM- 

 LM-MM at all fertilizer levels. For each cropping pattern, increasing 

 level of fertilizer did not significazitly increase totaZ. production 

 costs. 



In general, cropping pattern KM-HM-HM produced high gi-oss and 

 net income and returns to production inputs. Except for cash, returns 

 to fertilizer, labor, and management were not influenced by fertilizer 

 levels for each cropping pattern. Although cropping pattern HM-M-HM 

 produced high gross and net incomes, and ret-urns to pro^iuction inputs 

 on a dollar /dollar basis, rates of returns to fertilizer, cash, labor, 

 and management did not differ with patterns IM-LM-LM and HM-LM-MM. 

 Rates of return to fertilizer decreased with increasing fertilizer 

 level for each cropping pattern. 



