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m abel.alves@ipa.br ABSTRACT: Solar radiation influences the growth and development of plants. This work aimed to evaluate the effect of solar radiation under different seasons and cladode orientation during development and chemical composition of forage cactus varieties of the genus Opuntia and Nopalea. The experiment was conducted at the experimental station of the Agronomic Institute of Pernambuco (IPA), located in Arcoverde-PE. We used a randomized complete block design in factorial scheme (2x3x3), represented by two planting seasons (dry and rainy season), three cladode orientations (North-South, East-West and 45o angle between these), and three forage cactus varieties (“miúda”, “IPA clone 20”, and “IPA Sertânia”), totaling 18 treatments, with four replications. Response variables included fresh matter productivity (FMP), dry matter productivity (DMP), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), water content (WC), and absolute growth rate per dry biomass (AGRDB), every two years. There was no difference in DMP, CP, NDF, and ADF for planting seasons and cladode orientation. We observed differences in CP and ADF among cactus varieties, probably related to WC at harvest time. Solar radiation in the different seasons and cladode orientations did not influence dry biomass production and chemical composition of forage cactus. IPA Sertânia and miúda varieties showed the greatest DMP compared to IPA clone 20.

Influence of cladode orientation and planting season on development and chemical composition of forage cactus