This study aims to evaluate the effects of supplemental irrigation in bell pepper crop under shade mesh and in open-field to improve management of water resources. The experimental design was a randomized complete block with four replications and ten treatments in factorial arrangement (five irrigation levels combined with two shade levels). Irrigation treatments were 0.25, 0.50, 0.75 and 1.0 rate of crop evapotranspiration and the control (no supplemental irrigation). Shading treatments were 0 and 50% reduction of photosynthetically active radiation, compared to open field conditions. Crop coefficient was influenced by rainfall, especially during initial growth stage period when it was high and Kc values were 0.71, 1.17, and 0.92. Treatments under shade and open-field had no significant interaction effect, alike between the years of study. The yield in open-field and under shade mesh showed better performance in 0.75 and 0.50 of ETc, respectively. Maximum water productivity and irrigation water productivity was obtained in open-field and deficit irrigation plots. Under shade, highest fruit quality was obtained; heavier fruits, less dry matter, no sunscald and increasing value added to production. Comparing water consumption in open-field and shading, it can be obtained up to 14 to 25% water saving, significantly improving yield and fruit quality.

This study aims to evaluate the growth and development of sugarcane under different supplemental irrigation depths. Irrigation treatments were 0.30, 0.60, 0.90 and 1.2 rate of crop evapotranspiration (ETc) and the control (no irrigation). The experimental design was a randomized complete block with six replications. The highest yield was ratoon cane with 190 t ha -1 in the treatment 0.6 of ETc. The difference between the highest and lowest yield were 11 and 7% in plant cane and ratoon cane, respectively. The rate of maximum technical efficiency of yield was 0.78 of ETc. Irrigation water productivity and water productivity was obtained in 35.8 to 146.0 kg m -3 and 18.0 to 70.9 kg m -3 , respectively. The total mass and the dry mass showed increase of 20 and 25% in ratoon cane, respectively. The plant height showed no difference between treatments. The highest: number of tillers, leaf area and number of green leaves was treatment 1.2 of ETc. The deficit and excess moisture affect plant development, plant height, leaf area, stem diameter, number of tillers per meter, full mass and dry mass, affects the yield of sugarcane.

This study aimed to evaluate the effect of different irrigation depths and harvest dates in sweet potato for conversion to biofuels. Irrigation treatments were 0.25, 0.50, 0.75, and 1.0 of crop evapotranspiration rates and a control treatment (without irrigation). Harvest dates were: 90, 120, 150, 180, and 210 days after planting (DAP). The sweet potato cultivar BRS Cuia (RNC-27.315) was utilized. The experimental design was a randomized block in factorial arrangement (irrigation depths combined with harvest dates) with four replications. Reference crop evaporation was calculated based on the method of FAO Penman-Monteith. Drip irrigation system was used and irrigation frequency was every seven days. The highest and lowest yield were at 90 and 210 DAP, respectively. The lowest yield variation was between 120 and 150 DAP. Control treatment had highest yield in all harvest dates. Efficient water use was greater with irrigation of 0.25 of ETc with 116.9 and 218.8 m 3 ha at 90 and 210 DAP, respectively. Starch content, crude protein, length and diameter of the root, and yield were influenced by different irrigation depths and harvest dates.