Crescimento e marcha de absorção de nutrientes em melancia

Abstract

In spite of being one of the 5 largest watermelon’s producer countries in the world, Brazil still doesn’t achieve high productivity levels. Nutrition is one of the most important factors to increase the production and a better knowledge on the subject can leverage the cropping system. Get to know the real nutritional demand of the plant in each development’s stage helps significantly the conduct of farming and to achieve good results. That said, the present work aimed to evaluate the growth, the nutrients exportation, the absorption proportion and estimate the amount of the nutrients absorbed by YWM14 hybrid. The experiment was conducted on the research station of the Bayer Vegetable Seeds, located in the city of Uberlândia – MG, district of Martinesia, from July to October of 2014. The design was randomized block, consisting of eight treatments represented by plants’s sampling times (33, 40, 47, 54, 61, 68, 75 e 82 days after sow (DAS)), using three blocks. The results showed a steady increase in plant biomass gain, with the biggest increase in the plant (leaves + stem + fruit) from 61 to 68 DAS, and the descending order of absorption for accumulated macro and micronutrients totals in the whole plant (leaves + stem + fruit), stem + leaves, and fruit, were respectively: K>N>Ca>MG>P>S - Fe>Mn>B>Zn>Cu / N>K>Ca>Mg>P>S - Fe>Mn>B>Zn>Cu / K>N>P>Ca>Mg>S - Fe>Zn>B>Mn>Cu. At growth phase, bloom phase and fruit ripens phase, the K was the macronutrient of higher increase, whereas at fruit formation phase the higher increase was by the N. At all four phases the higher increase of micronutrient was by Fe.