João Alfredo Neto da Silva

DESFOLHA ARTIFICIAL SIMULANDO DANOS DE PRAGAS NA CULTURA DO MILHETO

O objetivo desta pesquisa foi avaliar os componentes de producao de plantas do milheto submetidos a niveis crescentes de desfolha de 0; 25; 50; 75 e 100%, realizadas nos estadios fenologicos (ED1, ED4 e ED7). O experimento foi composto por 15 tratamentos, dispostos em blocos ao acaso, com quatro repeticoes. As variaveis avaliadas foram diâmetro do colmo, massa seca da parte aerea e produtividade de graos de milheto. A maior reducao do diâmetro do colmo ocorre com 100% de desfolha em ED4. Desfolhas acima de 25% afetam a produtividade de graos, no estadio ED1, na cultura a campo. No estadio ED1, desfolha de 50%, reduz a massa seca da parte aerea e nas desfolhas de 75 e 100% nao afeta a produtividade das plantas.

CRESCIMENTO INICIAL DO PINHÃO-MANSO SUBMETIDO A DIFERENTES REGIMES HÍDRICOS EM LATOSSOLO VERMELHO DISTRÓFICO

The objective of this work was to evaluate different water regimes on initial growth and some physiological variables of physic nut ( Jatropha curcas L.) in dystrophic Haplustox. The experiment was carried under greenhouse conditions of the Embrapa Western Agriculture, located in Dourados, Mato Grosso do Sul State, Brazil. Treatments corresponded to water regimes of 20, 40, 60, 80 e 100% of the soil water retention capacity. The experimental design adopted was completely randomized with five treatments and five replicates. The evaluations of plants height, stem diameter and number of leaves were performed in six dates, while the variables stomatal conductance and photosynthetic rate were determined in two dates. At the end of experiment were evaluated the leaf area, dry mass of the leaves, petioles, stems and roots of all plants of physic nut. The water regimes of 60% and 80% of the soil water retention capacity provide the best responses to the physiological variables and of growth in the initial phase of physic nut. Available water contents in a dystrophic Haplustox, below of 60% and superiors the 80% of the soil water retention capacity induce signs of water stress in young plants of physic nut.

Produtividade de híbridos de milho em cultivo solteiro e consorciado com pinhão manso

The aim of this study was to evaluate the performance of maize cultivars fitotecnico crop system in monocrop and intercropped with jatropha. The experiment was conducted in 2009/2010 harvest , at Fazenda Paraiso , located in the District of Itahum , City of Dourados , State of Mato Grosso do Sul in soil classified as Oxisol . The experimental design was a randomized block in factorial 3x2 , three maize cultivars and two cropping systems (monocrop and intercropped) , with four replications . The interaction between maize varieties and cropping system , the total dry mass and productivity for the three cultivars cropping system had the highest averages , indicating the great competition for factors of production offered by jatropha at this time of year. The BRS 1010 highlighted in productivity compared to the other cultivars in both systems . In terms of yield, not recommended if intercropping maize with jatropha over three years old and planted at a spacing of 3x2 m , during spring / summer.