Snap Bean Plant Responses to Nitrogen Fertilization
1984
Peck, N. H. | MacDonald, G. E.
Nitrogen fertilization may affect vegetative growth as well as yield and quality of pods of snap bean [Phaseolus vulgaris (L.) var. humilis] plants. A study was conducted to determine the effect of N fertilization on vegetative growth, N partitioning in the plants and production of pods on snap bean plants. Snap bean plants, Bush Blue Lake-47, were grown under field conditions with N from ammonium nitrate at rates of 0, 4, 8, and 12 g m⁻² placed in a band 5 cm to the side and 5 cm below the depth of the seeds at planting time on 10 June 1981 in a Lima silt loam (fine-loamy, mixed, mesic Glossoboric Hapludalf), a productive soil derived from calcareous glacial till. Rows were 50 cm apart with 22 productive plants m⁻¹ of row (44 plants m⁻²). The fresh weight, dry weight, total N and nitrate N were determined in different parts of the plants at the seedling, bloom, and pod stages. Yield and quality determinations were made on the pods at 10 and 13 August harvests. Fertilizer N decreased growth of the plants in the seedling stage but not by the pod stage. Fertilizer N reduced the number of rhizobium nodules on the roots. At the pod stage, total N was 15.7 g m⁻² in plants grown with residual available soil N but without fertilizer N, while total N was 19.5 g m⁻² in plants grown with residual soil N plus fertilizer N at 12 g m⁻². Fertilizer N at 4 to 8 g m⁻² produced the optimum quality and yield of snap bean pods for processing.
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