U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska


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U.S. government work.


INTRODUCTION The greatest expression of the productive potential of crops is the result of the combination of a set of factors, including the population of plants, by having strong influence in various morphological and physiological characteristics and grain yield. The correct choice of the population should take into consideration information such as time of sowing, region, history of disease in the area, growth habit, growing and soil fertility and thus outlining the proper spacing for the culture. For each cultivar, there is an optimum range of population where plants take advantage of maximum radiation, water and nutrients, providing increased production, which should be associated with the ease of implementation of cultural management and cost of inputs. The objective of this work was to evaluate the influence of the density of snap bean of determined growth on commercial production, aiming at management for high yields.

MATERIAL AND METHODS The experiment was carried out at the State University of Londrina, with an altitude of 566 m, latitude 23º 23 'S and longitude 51º 11' W, in a soil classified as a dystrophic Red Latosol, the climate in the region classified according to Köeppen as subtropical moist mesothermic (Cfa) (Almeida et al., 2016). For the study were used the cultivars HAV 8 and UEL-1, both of determined growth. The experimental design was a randomized block design, with four replicates for each treatment. In each experimental unit, consisting of four rows, plant densities of 8, 10, 12, 14 and 16 seeds per linear meter were seeded. The line spacing was 0.50 m and, thus, the populations used as treatments for each material, were: T1 - 160000 plants ha-1, T2 - 200000 plants ha-1, T3 - 240000 plants ha-1, T4 - 280000 plants ha-1, T5 - 320000 plants ha-1. The plants were harvested 65 days after planting, when approximately 75% of pods have reached the commercial point. There are evaluated the components: average weight of 10 commercial pods for treatment and productivity (kg ha-1). For the classification of commercial and non-commercial in pods, the pods with a length of less than 10 cm, which were in the range of 10-15 cm long and with a diameter of less than 7 mm, and all the fibrous pods, were considered to be noncommercial. The rest were considered commercial. The data were subjected to analysis of variance and averages compared by Scott-Knott test, the 5% probability.