RESUMOO manejo do solo influencia a cobertura e a rugosidade na superfície, constituindo-se no principal fator que afeta a erosão hídrica. Utilizando um simulador de chuvas de braços rotativos, foram aplicados, no campo, três testes de chuva simulada no cultivo do milho e três no do feijão, com intensidade constante de 64 mm h -1 e energia cinética de 0,2083 MJ ha -1 mm -1 , no Planalto Sul Catarinense, entre março de 2001 e abril de 2003, para avaliar as perdas de água e solo nos seguintes tratamentos de manejo do solo, em duas repetições: solo sem cultivo com uma aração + duas gradagens (SSC); cultivos de milho e feijão com uma aração + duas gradagens sobre resíduos dessecados (PCO); cultivos de milho e feijão em semeadura direta sobre resíduos dessecados em solo previamente preparado (SDI); cultivos de milho e feijão em semeadura direta sobre resíduos dessecados em solo nunca preparado (SDD); cultivos de milho e feijão em semeadura direta sobre resíduos queimados em solo nunca preparado (SDQ), e solo sem cultivo com campo nativo melhorado (CNM). O experimento foi realizado em um Nitossolo Háplico alumínico argiloso, com inclinação média do terreno de 0,165 m m -1 . As perdas de solo foram fortemente influenciadas pelo sistema de manejo do solo, enquanto as perdas de água sofreram efeito apenas moderado. A SDI reduziu as perdas de solo 96 % em relação ao PCO, enquanto as perdas de água que equivaleram a 22 % do volume das chuvas
Brazil is one of the main producers of watermelon crops (Citrullus lanatus), which present great water requirement and offer in their irrigated cultivation, when well managed, the possibility of productive gains and fruit quality. The objective of this study was to evaluate the productivity and the vegetative development of the plant and the watermelon fruits of the 'Top Gun' cultivar submitted to Posse et al.; JEAI, 36(4): 1-11, 2019; Article no.JEAI.49215 2 different irrigation depths in the Northwestern region of Espírito Santo. The experiment was carried out in the horticulture sector of the Federal Institute of Espírito Santo-Campus Itapina, from September 30, 2017 to December 15, 2017. A completely randomized design was used consisting of six treatments corresponding to 50%, 75%, 100%, 125%, 150% and 175% of the reference evapotranspiration (ETo) calculated daily, with four repetitions of each treatment. The length of the branches of all the selected plants and the longitudinal and transverse lengths of their fruits were evaluated weekly. In the last analysis, the fruit weight was also collected and the productivity was estimated. Development and differentiated production responses were verified with the different depths applied. Water replacements corresponding to the 125% ETo leaf gave the best vegetative and productive development of the watermelon 'Top Gun' cultivar, cultivated in the northwestern region of Espírito Santo.
Original Research Article
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