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The objective of this study was to determine the use efficiency intercepted photosynthetically active solar radiation of Hovenia dulcis seedlings grown under different plant density treatments. The experiment was conducted in a greenhouse at the forestry nursery. A complete randomized block design was applied. The study was characterized by two plant densities; high (494 plants m) and medium (247 plants m) densities of seedling in the trays, and fifteen evaluation periods that began after first emergence. Evaluations were carried out every 15 days, totaling 210 days, with six replications. The leaf area index, total dry biomass of seedlings, partitioning of dry biomass, interception of global radiation, accumulated intercepted photosynthetically active radiation, and use efficiency of radiation were evaluated. The high density treatments promoted greater use efficiency and accumulation of intercepted photosynthetically active radiation in dry biomass of Hovenia dulcis seedlings. In this work, a model is present for analyzing the growth and development of plants and their relation to both photosynthetic rate and radiation use efficiency.

The high density of plants increases the radiation use efficiency of photosynthetically active seedlings of Japanese grape (Hovenia dulcis)