Abstract
The objective of this work was to evaluate the effect of potassium doses supplied via fertigation on yield and fruit quality of Solo papaya, cultivar THB. The experiment was installed in August 2018 in the Experimental Station of the Federal Rural University of Amazonia, Municipality of Igarapé-Açu, State of Para, Brazil, and lasted for 13 months. The experiment was conducted in completely randomized design with four replications and treatments applications started in the fifth month after planting. Treatments were four doses of K20 (160, 320, 480 and 640 kg K2O ha-1) that correspond to 50, 100, 150 and 200% of recommended dose based on soil analysis. Potassium was supplied in the form of KNO3, in the irrigation water, associated to the others fertilizers. During the five month harvest period, the papaya yield reached 22.3 t ha-1, fruit number was 67,776 fruit ha-1, fruit weight was about 418.6 g and soluble solid titratable acidity ratio as high as 13.9.
Highlights
Papaya (Carica papaya L.) is one of the most common fruit crops in almost all Tropical America Countries
Starting at the fifth month after planting, January 2019, fertilization was performed via fertigation following the recommendation of 280 kg N, 60 kg P2O5 e 320 kg K2O per hectar in the form of urea, purified monoammonium phosphate (MAP) and potassium nitrate, respectively, maintaining foliar application once a month (Sousa et al,; 2014)
Sample containing three fruits per each plot were collected and the following parameters were evaluated: fruit length measured from base to apex (FL); fruit diameter measured at the medium region (FD); and fruit weight (FW)
Summary
Papaya (Carica papaya L.) is one of the most common fruit crops in almost all Tropical America Countries It was first found by Spanish people in a region located from South Mexico to North of Nicaragua. Silva (2014) agree with the assumption that the expansion of the papaya production area in Brazil and its increase in yield are related directly to the insertion of improved production technologies able to promote better taste and fruit quality as well as higher income rate, enabled by higher yield and favorable conditions of domestic and international markets. Irrigation is considered as a production technology that makes possible to increase papaya production significantly, enables papaya cultivation in regions where water availability in the soil is low, contributes for generation of employment and income, reduces the migration from rural to urban areas and raises the farmland value. The objective of this work was to evaluate the effect of four doses of potassium, supplied via fertigation, on the development and production of the papaya crop, cultivar THB
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