48 



High management crops included 'Texas Grano 502' bulb onion, 'Blue Lake' 

 pole beaji, axLd 'Morris Heading' collard. 'Early Golden Summer Crookneck' 

 squash, and 'Florida Curled Leaif' mustard were selected as MM crops, 

 whereas 'Wando' English pea and 'Zipper Cream' southern pea were classi- 

 fied as LM crops. 



Design of cropping patterns . Based on crop management grouping, 

 four basic cropping patterns were developed using combinations of three 

 crops (Fig. ^■) . Cropping pattern HM-HM-HM (bulb onion-pole bean-collard) 

 was designed to estimate the effect of HM crop sequence and fertilizer 

 interactions on total productivity, profitability, and nutrient levels 

 in soil. Within this pattern subsequent effects of HM crops on succeed- 

 ing crops were observed. Similarly, cropping pattern LM-IM-LM (English 

 pea-southern pea-southern pea) was designed to estimate the effects of 

 Jli crop sequence on the same parameters. Cropping patterns HM-MM-LM 

 (bulb onion-squash-scuthern pea) and HM-Uyi-MM (bulb onion-southern pea- 

 mustard) vrere designed to determine and estimate the effects of combi- 

 nation of LM, MM, and HM crops on the same parameters. 



Levels of fertilizers . The crops were fertilized with low, 

 medium, and high levels of N and K depending on crop management grouping 

 (Table 7). These rates were based on several fertilizer and vegetable 

 production studies conducted in Florida (20, 56, 59, 159). For each 

 level, the combined N and K fertilizer treatments were considered as 

 single treatments. Rate of P application was fixed depending on crop 

 requirement. Basal fertilizer for each crop was applied and incorpo- 

 rated into the soil prior to planting. Depending on crop, the remaining 



