Browsing Society for Range Management Journal Archives by Authors
Comparative Growth Stages and Plant Parts for Critical Nitrate-N Concentration of SquirreltailHylton, L. O.; Ulrich, A. (Society for Range Management, 1969-05-01)The critical nitrate-N concentration for growth of squirreltail, Sitanion hystrix (Nutt.) J. G. Smith, was not appreciably affected by plant maturity when recently-matured blades rather than entire shoots were analyzed for nitrate-N. The critical nitrate-N concentrations for recently-matured blades were, respectively, 400, 500, and 500 ppm nitrate-N, dry basis, for the early vegetative, late vegetative, and late-boot growth stages. In contrast, the critical nitrate-N concentrations for shoots were 400, 600, and 1300 ppm, respectively, for the same growth stages. Recently-matured blades should, therefore, be collected to determine the N status of squirreltail in the field at any active growth stage. A high N status increased top growth preferentially to root growth. Hence, the ratio of tops to roots increased from 1.0 to 3.0, for N deficient and N sufficient plants, respectively.
Critical Nitrate-N Concentrations for Growth of Two Strains of Idaho FescueHylton, L. O.; Ulrich, A. (Society for Range Management, 1968-09-01)Nitrate-N in shoots of different strains of Idaho fescue, Festuca idahoensis, can be used for an adequate diagnosis of their respective N statuses at the late vegetative growth stage. The suggested critical nitrate-N concentration for growth of Elmer Idaho fescue, the improved strain used in this study, is 500 ppm of nitrate-N in the shoots, dry basis. The suggested critical nitrate-N concentration for growth of the nonimproved strain is 140 ppm of nitrate-N, dry basis. These critical concentrations are guides that can be used to determine the N status of Idaho fescue on rangelands. Nitrate-N in shoots of Idaho fescue should be above 500 ppm, dry basis, during active vegetative growth, if maximum forage production is desirable.
Sulfur Needs of Spanish Clover and the Relation of Sulfur to Other Nutrients as Diagnosed by Plant AnalysisHylton, L. O.; Cornelius, D. R.; Ulrich, A. (Society for Range Management, 1968-05-01)Sulfur needs of Spanish clover, Lotus purshianus (Benth.) Clements and Clements, were determined by plant analysis in a nutrient solution study. Top growth was affected more than root growth by changes in S supply. Protein synthesis in the shoots was affected little by S deficiency. Sulfate-S was better than organic-S or total-S to diagnose the S status of the plant adequately. The critical sulfate-S concentration for growth of the plant is about 100 ppm, dry basis, in the middle stem section of the shoots.