Luiz A. C. Lovadini

Efeito da adubação verde do feijoeiro "da sêca" com Crotalaria juncea L., empregando-se toda a vegetação ou retirando-se do campo as hastes despojadas de suas fôlhas

Sunn-hemp (Crotalaria juncea L.) was tested as a green manure for beans (Phaseolus vulgaris L.) in several localities of the State of Sao Paulo. The green manure was planted in the same area that was subsequently sown with beans. Incorporation of the whole plants or only their leaves were compared. The mean yield increase resulting from the treatments when compared with the checks was 41 % in the first case and 28 % in the second.

Efeitos sõbre a produção do feijoeiro, da aplicação de diversos tipos de matéria orgânica, não decomposta, na presença de adubação mineral com P, NP, PK

Nitrogen was the element that limited the yield of dry beans. In the plots with P alone, the responses to the side-placed organic materials were very good and increased in the order: sugar cane thrash, Melinis minutiflora hay, Glycine javanica hay, coffee tree leaves, coffee fruit hulls and peanut hulls. In the NP plots, the yields were generally higher but only peanut hulls, M. minutiflora hay and the double dose of coffee tree leaves induced small increases.

Emprego de Dolichos lablab L. como adubo verde. I - Estudo do plantio intercalado na cultura do milho

In five localities in the State of Sao Paulo the interplanting of Dolichos lablab L. var. 697 with corn was studied. The effects of time and methods of planting of Dolichos and interplanting at different proportions of Dolichosand corn on the production of corn was investigated. Interplanting Dolichosand corn and the incorporation of Dolichosdid not have any influence on corn production. Dolichos can be planted from October to February and it produces more green matter when planted in October that is at the same time as corn, than later.

Adubação mineral do feijoeiro: XI - Efeitos de N, P, K e da calagem, em campos cerrados do Planalto Paulista

Two experiments with dry beans (Phaseolus vulgarisL.) were conducted for two years in the southern section of the Sao Paulo Plateau to study the responses to the indicated treatments. The application of dolomitic lime and principally that of phosphorus were the factors that controlled the yields. Both materials were more effective when applied in the presence of one another. The immediate and residual effects of phosphorus were similar, but liming acted better in the second year.

Número mais provável e eficiência de Rhizobium autóctone para soja perene e siratro em quatro Grandes Grupos de solos do estado de São Paulo

Experiments were carried out in glass-house, in order to evaluate the number and efficiency of native rhizobia nodulating perennial soybean and siratro in four soils under grasses and perennial soybean vegetations. All the experiments were carried out in Leonard jars; the efficiency of native rhizobia was compared with the effective SMS-137 (=CB453) strain. Results have shown that the MPN of Rhizobiumnodulating perennial soybean in soils under grasses were between 0.36xl02 and 15.7xl02. For siratro, higher populations were observed and the numbers were between 0.36 x 102 and 126.0 x 102. It was also observed that the population of Rhizobiumnodulating siratro and perennial soybean, in the Latosolic B Terra Roxa under vegetation of perennial soybean is higher than under pangola grass (Digitaria decumbensStent), or corn. The efficiency of indigenous Rhizobiumwhich associates with perennial soybean was similar to that of the strain SMS-137 for the Podzolized Soil on Calcareous Sandstone-Marilia variation, but not for the others soils (Dark Red Latosol Sand Phase, Ortho Red-Yellow Latosol, and Latosolic B Terra Roxa). Previous cropping with perennial soybean did not affected significantly the efficiency of perennial soybean rhizobia. The efficiency of indigenous rhizobia which associates with siratro was lower than that of strain SMS-137 only in the case of the Latosolic B Terra Roxa. Previous cropping with perennial soybean has increased the efficiency of siratro Rhizobium, indigenous to that soil.

Nutrição mineral da soja perene (Glycine wightii Verdc.): I - Ensaio de adubação em solo de cerrado

Sao relatados os resultados de uma experiencia de adubacao com delineamento fatorial 33, instalada em solo de cerrado (Latossolo Vermelho Escuro fase arenosa), na Estacao Experimental de Jupia (CESP), para o estudo dos efeitos da aplicacao de calcario, fosforo e potassio, em tres niveis, na producao de forragem de soja perene. Os resultados experimentais revelam que o calcario e o fosforo produziram efeitos altamente significativos sobre a producao; o potassio nao provocou efeitos significativos, e tampouco foram significativas as interacoes entre os elementos estudados. Embora nao significativa, ocorreu interacao negativa entre calcario e fosforo: o efeito de cada um deles foi diminuido sempre que a dose do outro foi aumentada.