Mark R. McMurtry

Fish and vegetable production were linked in a recirculating water system designed to achieve a high degree of efficiency of water use for food production in addition to functional and technological simplicity. Hybrid tilapia Oreochromis mos-sambicus X 0. niloticus L. were grown in tanks associated with biofilters (sand beds) in which tomatoes Lyco...

The effects of four biofilter volume (BFV)/culture tank volume ratios (0.67/1, 1.00/1, 1.50/1, and 2.25/1) on biofilter function were examined in a recirculating fish/vegetable production system in a greenhouse. Sand beds served as biofilters, as substrate for vegetable growth, and as location for decomposition of waste solids. No fertilizer was us...

Increasing plant density from 21,550 to 43,100 per hectare by doubling the rows/bed increased cumulative yield 64 to 80% for 3 hybrid lines of asparagus and but only 6% for 'Rutgers Beacon' grown at Clinton, NC. The effects of doubling the plant density were still apparent the 13th year of harvesting. In another study, yields of 'Princeville' ('Mar...

Fish and tomato (Lycopersicon esculentum Mill.) production were linked in a recirculaing water system. Fish (tilapia) were fed a commercial diet with 32% protein. Tomato cultivars ‘Laura’ and ‘Kewalo’ were grown during summer 1988 and spring 1989, respectively, in a Raleigh, NC greenhouse. Plants were grown in biofilters at 4 plants/m and surface i...

Fish and vegetable production were linked in a recirculating water system. Hybrid tilapia were grown in tanks and fed a commercial feed. Tomato or cucumber were grown in sand biofilters associated with each tank. Four tank to biofilter volume ratios, ranging from 1:0.67 to 1:2.25, were studied by varying the biofilter size. Plant populations were d...

Fish and vegetable production were linked in a recirculating water system. Hybrid tilapia were grown in tanks and fed a commercial feed. Tomato or cucumber were grown in sand biofilters associated with each tank. Four tank to biofilter volume ratios, ranging from 1:0.67 to 1:2.25, were studied by varying the biofilter size. Plant populations were d...

We evaluated high plant population of watermelons when grown on black plastic with drip fertigation. We grew watermelons in 1.5m or 1.8 m centered rows, with one or two plants per hill, at spacing from 0.45 to 1.5 m in-row. Single plants constantly out yielded 2 plant hills and produced bigger melons. Large (over 9 kg) melon yields were not differe...

We evaluated high plant population of watermelons when grown on black plastic with drip fertigation. We grew watermelons in 1.5m or 1.8 m centered rows, with one or two plants per hill, at spacing from 0.45 to 1.5 m in-row. Single plants constantly out yielded 2 plant hills and produced bigger melons. Large (over 9 kg) melon yields were not differe...