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Optimum nutrient levels were derived by comparing the polynomial tegression curves relating leaf analyses and crop yields with rates of applied nitrogen, phosphorus and potassium. IJppermost mature leaves were used for analysis, and samples ivere collected-it specific physiological stages of development.In two seasons the optimum ler,-els in sweet corn difiered by 7,25 a.nd 9 per ccnt, and in snap beans by 12. 29 end 1l per cent for nitrogen. phosphorus and potassium resp.ectivel)'. A lorv moisture supply was generally associated with lorver optimun: levels for all three nutrients, but "excess" moisture had only slight effects on these levels for any nutrient.Optimum nutrient levels rvhich rvere calculated from ample moisture conditions s'ere, for the tassel-emerging stage of srveet corn, 3.5, 0.18 and 2.5 per cent, and at the early flou'er siage bf snap beans 5.1, 0.'10 and 2'0 per cent fo.r'n-itrogen, pl-rosphorus and poiassium,.respectively. At the sixth to seventh leaf stage of su'eet corn optimum levels were higher tor nrtrogen and potassium'but lorver for phosphorus (3.8, 3.1 and 0.34 per cent lgsPe,ctively), and at thc pollen-shedding stage the levels rvere only slightly different than at tassel-emergence.

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Mclntosh apples from trees having a high and low content of N as deternrined by leaf analysis were storcd in modified atmospheres of zero, 5, or 77" CO, in a range of O, levels from 2.5 to 20'/1. Fn-rit