In this research, we have modeled the relationships between leaf nutrient concentrations and the yields of avocado trees with the aim of developing decision support tools for improved fertilization and nutrient management to increase avocado fruit yields.
Use of Plant Growth Regulators to Increase Fruit Set, Fruit Size and Yield and to Manipulate Vegetative and Floral Shoot Growth
This research addresses the research priority: “The role of endogenous and exogenous growth regulators in avocado and the evaluation of commercial growth regulators on flowering, fruit set, fruit size, yield and vegetative growth.”
This project is examining the effect of salinity on the yields of avocado trees across a transect of regions that represent all of the major growing areas for avocado in S. California. There are two components of salinity stress on avocado, including water stress that is caused by elevated levels of total dissolved salts (TDS), and specific ion toxicities that are caused by chloride and sodium.
The increasing costs of inputs necessary for avocado production dictate that growers of the 'Hass' avocado in California increase profitability per acre. The goal of this research is to increase net income per acre by developing plant growth regulator (PGR) strategies that increase yield of commercially valuable fruit.
The goal of the research is to obtain the efficacy data necessary to add a PGR use for avocado to an existing PGR label. Given that avocado orchards alternate bear, the California Department of Pesticide Regulation (DPR) will accept yield benefits that are significant only in an on- or an off-crop year, as 2-year cumulative yield or when averaged across the on- and off-crop year.
California avocado growers must increase yield, including fruit size, and/or reduce production costs to remain competitive in the US market, which now receives fruit from Mexico, Chile, New Zealand, Dominican Republic and an increasing number of other countries (http://www.ers.usda.gov/Data/Fruit VegPhyto/Data/fr-avocados.xls). Despite the popularity, the ‘Hass’ cultivar (Persea americana Mill.) is known to be problematic with regard to fruit retention, fruit size and alternate bearing.
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