. 1989. The effect of munricipal wastewater irrigation and rate of N fertilization on petiole composition, yield and quality of'Okanagan Riesling' grapes. Can. J. Plant Sci. 69: 1285-1294. Okanagan Riesling(Vitis sp.) vines, planted on a sandy soil in 1983, were trickle irrigated with municipal wastewater or well water and with each source of water there were 3 rates of Nfertilization (0, 17 and 34 g N as NH4NO, vine-l y-r), [1984][1985][1986][1987]. The zero-N treatment was increased to 8.5 g N vine-r in [1986][1987]

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‘Macspur McIntosh’ and ‘Red Chief Delicious’ apple (Malus domestica Borkh.) on M.7a rootstock were subjected to treatments involving all combinations of two types of irrigation water (well-water or municipal effluent) from 1983, the year of planting, through 1987 and three rates of N fertilization (0, 200, 400 g NH4NO3/tree per year), from 1984 through 1987. The zero N treatment was increased to 100 g NH4NO3/tree per year in 1986 due to low vigor of these trees. Effluent irrigation increased leaf N, P, and K concentration in 4 of 5 years for ‘McIntosh’, while leaf N, P, and K increased in 1, 4, and 2 years, respectively, for ‘Delicious’. Effluent irrigation increased trunk diameter increment in all years and fruit number and yield in 1985-86 for both cultivars. No major horticultural limitations to the use of effluent irrigation were observed. Nitrogen fertilization increased leaf N in 3 years for ‘McIntosh’ and 2 years for ‘Delicious’, while leaf P and K were decreased at the highest N rate in 2 years for each cultivar. Nitrogen fertilization did not increase trunk diameter and increased fruit number and yield only in 1986 after 3 years of a zero N treatment. The results implied a role for P in the establishment and early growth and yield of young apple trees.

Tomato (Lycopersicon esculentum L.), sweet pepper (Capsicum annuum L.), onion (Allium cepa L.), cucumber (Cucumis sativus L.), bush bean (Phaseolus vulgaris L.), and melon (Cucumis melo L.) were grown from 1983 through 1986 with trickle irrigation using either well water or secondary effluent. Yields with effluent irrigation were greater than or similar to yields obtained with well water. Effluent irrigation resulted in decreased Zn, increased P, and variable results for other nutrients in plant tissues. After 4 years of effluent irrigation, the exchangeable Na content of the 0.0 to 0.3-m depth increased, but soil chemical changes were of little practical significance. No major limitations were found for the production of high yields of vegetables irrigated with municipal wastewater on the loamy sand soil at the experimental site after 4 years.