Impactos de lâminas, frequências e clones sobre a eficiência do uso dos recursos naturais pela palma forrageira

Abstract

As an alternative to mitigate the high water deficit in semiarid environments and, seeking better use of natural resources efficiently, the use of adapted crops such as forage cactus and the use of irrigation, becomes a promising alternative for the region. Thus, the objective was to evaluate the effect of different frequencies and different irrigation deep, on the performance of the variables of efficiency in the use of natural resources, aiming to establish a relationship due to water availability on the conditions of the semiarid of Pernambuco. The experiment was conducted in Serra Talhada, Pernambuco, Brazil, in a randomized block design (DBC), in a factorial system, composed of two clones of forage palm Orelha de Elefante Mexicana (OEM) and Miúda (MIÚ), with five replicates each, four irrigation deep: 0.5; 1.0; 1.5; 2.0 liters per pot; four irrigation frequencies: 7, 14, 21 and 28 days, plus rainfed conditions. The harvest was carried out to quantify the yields of treatments to calculate the efficiency indicators of the use of natural resources. The blade factor showed a decrease in water use efficiency, while the applied blade was increased, with its maximum application efficiency of 0.5 L, an inverse trend was observed for intercepted photosynthetically active radiation that had maximum efficiency when applied to 2.0 L blade, for the results of the efficiency of the use of radiation there was no significant difference (p>0.05). For the frequency factor, there was a significant difference (p<0.05) for the frequency of 21 days for the water use efficiency ratio, while for intercepted photosynthetically active radiation the increase in frequency decreases its efficiency, in the same way as the results for the frequency showed no difference between (p>0.05). For the clone factor, there is a significant effect, with emphasis on the uses of natural resources, the OEM clone. For the blade x frequency interaction, the best results were obtained for the efficiency in the use of water and for intercepted photosynthetically active radiation, while for the efficiency in the use of radiation, all interactions were the same. Regardless of the clone, irrigation frequencies between 14 and 21 days, in a water regime of 0.5 and 1.0 L, promote greater efficiency for the USA, RFAinter and EUR.