Publication Date:
1987-08-01
Description:
Black locust (Robiniapseudoacacia L.) is a fast growing leguminous tree capable of forming a symbiotic association with Rhizobium spp. Since nodulation of legumes is often affected by available soil nutrients, a greenhouse study was conducted to determine the combined influence of different levels of added nitrogen and phosphorus on nodulation, N2 fixation, and growth of black locust. Black locust seedlings were grown in pots for 30, 60, and 105 days in 16 nutrient combinations (4 levels of P × 4 levels of N). All pots were inoculated with rhizobial isolate B143. As the level of P was increased, the number of nodules per plant, nodular dry weight, shoot height, and dry weights of stem, leaves, and total plant also increased. In contrast, the number of nodules and nodular dry weight were inhibited at high (100 mg N kg−1) and low (0 mg N kg−1) levels of added N as compared with the medium levels (25 and 50 mg N kg−1). In addition, the interaction between the N and P factors was significant for plant and nodule dry weights, acetylene reduction rates, and foliar concentrations of N and P.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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