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The response of physiological traits of four genotypes of  Opuntia  spp (AN-V1, AN-V3, AN-V5, and AN-TV6) to organic fertilization with two levels of thickness and different plant densities (10, 20, 30, 40, and 50 plants/m 2 ) under plastic tunnels were studied in the Universidad Autnoma Agraria “Antonio Narro” in 1995 and analyzed at CIBNOR, La Paz, Mexico. The main goal of this work was to screen  Opuntia  genotypes for yield and photosynthetical efficiency. The experiment was established as a randomized blocks design with three replicates. Response variables were dry weight (DW), crop growth ratio (CGR), rate of crop growth (RCG), relative growth rate (RGR), leaf area index (LAI), and net assimilation rate. The annual average temperature in the study site was 19.8°C. Hottest months were July and August, with temperature values as high as 39°C. The lowest temperatures were recorded in December and January, with temperatures as low as –13°C. Annual rainfall was 365 mm. Soils in the study region show a generalized low fertility. According to our results, genotype AN-V1 showed the best photosynthetical features with 30 plants/m 2 ; genotype AN-TV6 showed no differences for 40 and 50 plants/m 2 . The highest values for CGR and RCG were observed under the highest level of organic fertilization (16-cm thickness). Genotypes AN-V3 and AN-V5 evidenced the highest RCG. Other results suggest that AN-V3 and AN-V5 showed the highest value for LAI, for a density 50 plants/m 2 , and genotypes AN-V1 and AN-V3, with a density 40 plants/m 2 , had the highest RGR. The studied  Opuntia  genotypes appeared to be promising crops for marginal semiarid regions.

hortscience

The Influence of Organic Fertilization and Different Plant Densities on Physiological Traits and Production of Nopal (Opuntia spp.) under Plastic Tunnels