Virna Braga Marques

Productivity of lettuce and rocket in intercropping system under organic and mineral fertilization

Foram realizados dois experimentos em Lavras-MG, nos meses de abril a setembro de 2006. Para cada experimento, utilizou-se o delineamento de blocos completos casualizados, com cinco tratamentos e quatro repeticoes. Os tratamentos consistiram de quatro arranjos espaciais entre as culturas da alface (A) e rucula (R), plantadas em fileiras alternadas 1A:1R; fileiras duplas alternadas 2A:2R; fileiras triplas alternadas 3A:3R e quatro fileiras alternadas 4A:4R e, alface e rucula em cultivo solteiro. Avaliou-se o diâmetro (alface), altura, numero de folhas por planta, rendimento de folhas e massa seca da parte aerea da alface e rucula. Os maiores rendimentos de folhas da alface foram registrados no cultivo orgânico. O rendimento de massa verde da rucula, no sistema solteiro sobressaiu-se dos demais, embora estatisticamente semelhante aos arranjos espaciais 3A:3R e 4A:4R no numero de folhas. No cultivo orgânico, diferencas significativas entre o primeiro e o segundo ciclo da rucula expressaram-se na altura de plantas e na massa seca da parte aerea, com a maior altura media no primeiro cultivo e a maior quantidade de massa seca da parte aerea na rebrota. Os consorcios da alface e rucula nos arranjos espaciais 1A:1R e 3A:3R tiveram a maior eficiencia do uso da area (EUA), de 55 e 63%, respectivamente, no sistema de cultivo orgânico. A eficiencia biologica aumentou para 62 e 70% nestes mesmos arranjos, com o cultivo da rebrota da rucula no sistema orgânico. Todas as associacoes da alface e rucula, assim como os seus cultivos solteiros tiveram melhor desempenho produtivo sob a adubacao orgânica. A rebrota da rucula aumentou a eficiencia agronomica do sistema consorciado.

Fenologia reprodutiva de pitaia vermelha no município de Lavras, MG

The study of phenology can contribute to improve the productivity of crops and fruit quality. The study was conducted to evaluate the reproductive phenology of red pitaya in Lavras, MG, Brazil. It was evaluated in one hundred plants of pitaya (Hylocereus undatus (Haw.) Britton & Rose) the subphases periods from the issuance of buds to fruit ripening from 2008 to 2010. The bud develops from 19 to 21 days. The anthesis is nocturnal which lasts about 15 hours. The maturation occurs from 30 to 40 days after flower opening, when the fruit acquires color pink to deep red and firm texture. In Lavras, MG the reproductive period of red pitaya occurs from November to May and the time of appearance of flower buds to fruit harvest is from 50 to 60 days.

Crescimento de pitaia vermelha com adubação orgânica e granulado bioclástico

The objective of the study was to evaluate the growth of red pitaya (Hylocereus undatus) subjected to organic fertilization and calcified seaweed application. The experimental design was in randomized blocks with eight fertilization: control, cattle manure, chicken manure, calcified seaweed, cattle manure + chicken manure, cattle manure + calcified seaweed, chicken manure + calcified seaweed and cattle manure + chicken manure + calcified seaweed, applied every three months, with three replications and plot consisted of four plants. There were no significant differences in the length and in the number of central cladodes. There were significant differences in the number of side cladodes removed and in cladodes above the support. Fertilization with cattle manure + chicken manure + calcified seaweed favored the growth of red pitaya.

Utilização de água residuária de suinocultura na produção de mudas de maracujazeiro-azedo cv Redondo Amarelo

Besides being a nutrient source, the swine wastewater is a practice of water reutilization and it avoids water and soil pollution. This work was carried out to evaluate the swine wastewater application for yellow passion fruit development. It was used the completely randomized block design, in a 5 x 2 factorial scheme, with four replications and seven plants per plot, being the wastewater levels (0, 25, 50, 75 and 100 percent) and substrates (commercial and soil + sand mixture, in the proportion of 2:1). After 60 days, it was evaluated the length of both the aerial part and the root system (cm), leaves number, leaf area (cm2) and dry matter weight from both the aerial part and the roots (mg) and both foliar and fertility analysis of the sand/soil mixture substrat. The best passion fruit seedlings development happened with the swine wastewater application at levels 100 percent. The swine wastewater utilization in initial stage supplied the nutritional demand of the passion fruit seedlings without the supplement of commercial fertilizers. The commercial substrate utilization provided a higher passion fruit seedlings development.

Produção e qualidade de frutos de pitaia-vermelha com adubação orgânica e granulado bioclástico

The aim of the work was to evaluate the influence of organic fertilization and application of calcified seaweed in production and fruit quality of red pitaya. The experimental design was randomized blocks with eight fertilizers: control, cattle manure, chicken manure, calcified seaweed, cattle manure + chicken manure, cattle manure + calcified seaweed, chicken manure + calcified seaweed and cattle manure + chicken manure + calcified seaweed, applied every three months since September 2008, with three replications and plot consisted of four plants. Fruits were evaluated in February / March 2010. After harvesting the cladodes of plants were removed for carrying out the analysis of the levels of nutrients, in July 2010. Transverse diameter, longitudinal diameter, mass, pulp percentage, acidity, soluble solids and ratio were evaluated. Data were subjected to analysis of variance and Scott-Knott test at 5% probability. The plants fertilized with cattle manure + chicken manure produced the highest number of fruits per plant and the addition of calcified seaweed favored fruit quality of red pitaya.