Search

The present study was carried out at Liliana Dimitrova Horticultural Research Institute, with the objective of evaluating the effect of nutrient solutions with different nitrogen/potassium fertigation ratios for protected tomato (HA-3019 hybrid) crop on biomass accumulation and macronutrient uptake within two planting times. Four N/K ratios (1:1.5; 1:2.0, 1:2.5 or production check, and 1:3.0) were studied in spring-summer season (March/July) and winter (September/January). Biomass accumulation (g.m-2) and N, P, K, Ca and Mg consumption were determined per plant organ and total biomass (g.m-2) for each treatment. In winter, dry weight and N, K and Ca uptake were significantly higher than in spring-summer season, whereas the top growing and nutrient consumption period corresponded to full production phase. The lowest leaf, stem and total biomass production corresponded to N/K ratio 1:1.5 in spring-summer; meanwhile dry fruit weight was significantly higher for N/K ratios 1:2.0 and 1:2.5. In winter season, significant fruit and total biomass values were recorded for N/K ratio 1:2.5 (production check); however, leave growth was similar in treatments 2, 3 and 4 (1:2.0, 1:2.5 and 1:3.0). Macronutrient extraction showed a similar behaviour to that obtained for biomass accumulation. [ABSTRACT FROM AUTHOR]

During two seasons (2003-2004 and 2004-2005), from the end of October to March, the effect of applying liquid humus (HL) was evaluated on the biological, productive yields and fruit quality of tomato Amalia variety. With this aim, two experiments were carried out, totally randomized under a small farmer's production conditions from Havana province, consisting of an Eutric compacted Red Ferralitic soil, where studies of some of its physico-chemical properties were made, that offered the information of being a soil with adequate properties for a good crop development. The biological indicators evaluated are stem length and diameter, number of leaves and inflorescences, productive indicators (number and fruit weight per plant), indicators of external fruit quality (polar and equatorial diameters) and internal quality (acidity, SST, ºBrix, vitamin C, dry weight), agricultural yield (t.ha-1) and the economic analysis per each treatment. For 2004-2005 season, the infestation index as well as the social impact were evaluated based on fruit quality. Results show the sensitivity of this tomato variety before the biostimulating action of liquid humus, applied to leaves in two doses at intervals of 15 days and concentrations of 1 mL HL/30 mL and 1 mL HL/40 mL water, seven days after transplanting (ddt), increasing the biological, productive yields, quality and social impact, with productive stage reduction, under a small farmer's production conditions, they being economically feasible, mainly HL at 1/30 concentration. [ABSTRACT FROM AUTHOR]

This experiment was carried out in a technically-made nursery from Tapaste, San José de las Lajas, with the objective of studying the effect of Biobras-16, a national growth biostimulant on mammee reproduction through grafting. The buds once treated were grafted on rootstocks using two different techniques. Results proved that the use of Biobras-16 showed significant percent values of live graftings compared to the control treatment. [ABSTRACT FROM AUTHOR]

A water management study in one irrigation system, its effect on the electric conductivity of soil saturation extract and rice yield was conducted at "Cubanacán" farm, pertaining to "Los Palacios" Rice Agroindustrial Complex, for three poorly rainy and three rainy seasons, whereas water management on nonsloping terraces did not show any statistical effects, either upon yield or electric conductivity. [ABSTRACT FROM AUTHOR]