Efficacy oftrifluralin formulations and doses in soybean

O objetivo do presente trabalho foi avaliar a eficácia das diferentes formulações de trifluralin para o controle de poáceas na cultura da soja (cv. Garimpo), em Latossolo Vermelho-Amarelo, textura arenosa, em Uberaba, MG. Os tratamentos testados foram: trifluralin GrDA (500 g/l) a 750 e 1000 g/ha, trifluralin CE (600g/1) a 720 g/ha e trifluralin CE (445 g/ I) a 667 g/ha, testemunhas capinada e sem capina. O ensaio foi instalado no desenho experimental de blocos casualizados, com quatro repetições. Observou-se que as duas formulações do herbicida trifluralin (GrDA e CE), nas doses utilizadas, foram eficientes (80-90%) para o controle de Brachiaria decumbens e B. plantaginea. As características agronômicas da soja, como produtividade, altura das plantas, inserção da primeira vagem, peso de sementes e índice de colheita mecânica não foram afetados de forma distinta pelas formulações e doses usadas. Os herbicidas usados também não provocaram toxicidade à soja. Entretanto, observou-se uma leve superioridade da formulação CE no controle inicial de B. decumbens (15 dias após aplicação) e final de B. plantaginea (45 dias após aplicação).The objective ofthis study was to evaluate the efficacy of different formulations oftrifluralin to control grass weeds in soybean (cv. Garimpo) on a Red-Yellow Latossolo, with a sandy texture, in Uberaba, MG, Brazil. The treatments were: trifluran WG (500 g/l) at 750 and 1000 g/ha, trifluralin EC (600 g/I) at 720 g/ha and trifluralin EC (445 g/l) at 667 g/ha, as well as an unweeded and a weeded control. The experimental design was a complete randomized block with four replications. The two trifluralin formulations (WG and EC) controlled 80-90% of Brachiaria decumbens and B. p/antaginea. The agronomic characteristics of soybean such as productivity, plant height, first pod insertion, seed weight, and mechanical harvest indice, were not affected by the formulations nor doses of trifluralin. The' herbicide also did not provoke toxicity to the soybean. However, a slight superiority of the EC formulation in the early control of Brachiaria decumbens (15 days after herbicide application) and late control (45 days after herbicide application) of B. plantaginea was noticed

Adubação foliar do algodoeiro (Gossypium hirsutum, L., var. I.A.C.12), com nitrogênio, fósforo e potássio avaliada pela produção e diagnose foliar

This work was carried out on latosolic soil type, called "terra roxa estruturada", Luiz de Queiroz serie. It was installed in November 1968 and was finished in May 1969, using the I.C.A. 12 (G. hirsutum L.) variety. The objectives of this work were: 1 - Evaluate the effect of foliar spraying in the yield increase. 2 - Evaluate the effect of foliar spraying by foliar diagnosis, and determine correlations between the yield and nitrogen, phosphorus and potassium concentrations in the petioles of leaves of productive and unproductive branches. 3 - The experimental design consisted of complete randomized blocks with 3 replications with part of the treatments in a 4 x 3 factorial arrangement; 4 representing the number of levels and 3 the number of fertilizers. Apart from these, 12 treatments were included: N0P0K0 , N1P3K3 , N3P1K3 , N3P3K1 and N3P3K3 Each block consisted of 21 plots because the N0P0K0 and N3P3K3 treatments were replicates 3 times within each block, in order to increase the accuracy of the respective mean values. The levels of these elements were as follows. In the soil and foliar fertilization the fertizer used as a source of nitrogen was urea (46% N), as a source of phosphorus concentred superphosphate (45% P2O5) and as a source of potassium, potassium chloride (60% K2O). The results obtained show that: 1 - No statistical differences were found in the production of branch cotton. Then mean value reached 3,366.09 kg/Ha. it should be pointed out, however, that in the relative percentage with respect to the check tratment there were increases of 17,15%, 20,50% and 23,01%. These were obtained with the N3P3 + K2 *, N3K3 + P3* and P3K3 + N2* treatments respectively. 2 - The mean percentage concentrations of nitrogen, phosphorus and potassium which were found in the petioles were the following: No statistical differences were found, for each sampling, in the concentrations of these three nutrients in the petiole of the respective branch. The first sampling was carried out 86 days after germination and the second 116 days after germination. 3 - Total significant correlations were found in the percentages of potassium with yield in the first sampling for petioles of leaves of productive branches and in the second sampling for petioles of both productive and unproductive branches : Total correlations were also obtained between the phosphorus percentages and yield in the first sampling for petioles of both types of branches and in the second sampling just for petioles of productive branches: No statistical difference was found, in relation to the type of sampling, between the correlations of the petioles of leaves of both types branches.Aplicações de adubos por via foliar no algodoeiro tem sido feitas em outros países; porém, no Brasil, tal prática encontra-se no inicio. Com o presente trabalho, foi estudado o efeito da adubação foliar nos aumentos de produção e foi estabelecido correlações entre a produção e as concentrações de nitrogênio, fósforo e potássio, nos pecíolos das folhas de ramos produtivos e não produtivos

Cyclanthera pedata (L.) Schrad. var. edulis (Naud.) Cogn. - uma Cucurbitaceae pouco conhecida na alimentação humana

São mencionados os diversos usos como alimento dos frutos de Cyclanthera pedata (L.) Schrad. var. edulis (Naud.) Cogn., além de sua descrição morfológica e de seus nomes vulgares, objetivando um melhor conhecimento e ou divulgação dessa nova opção entre as fontes já bastantes conhecidas de alimentos

A flórula invasora da cultura do café (Coffea arabica L.) no Estado de Minas Gerais, Brasil Weeds in coffee (Coffea arabica L.) plantations in the state of Minas Gerais, Brazil

Nas áreas de cultura de café (Coffea arábica L.), no Estado de Minas Gerais, foram coletadas e identificadas 388 espécies de plantas invasoras (= plantas daninhas), pertencentes a 51 famílias botânicas, representando 182 gêneros, sendo que as famílias Compositae, Gramineae, Leguminosae, Malvaceae, Solanaceae, Euphorbiaceae, Rubiaceae, Amaranthaceae, Convolvulaceae e Verbenaceae, são as mais importantes em relação à cultura. As plantas coletadas, devidamente etiquetadas e identificadas, foram anexadas, parte delas no PAMG (Herbário da EPAMIG, Belo Horizonte, MG) e, a outra parte, no Herbarium ESAL (Herbário do Departamento de Biologia da Escola Superior de Agricultura de Lavras - ESAL, Lavras - MG).<br>A survey in the cultivation area of coffee in the State of Minas Gerais, Brazil, has resulted in the determination of 388 weed species, of 182 genera belonging to 51 families; the families presenting a greater number of espécies are: Compositae, Leguminosae, Gramineae, Malvaceae, Solanaceae, Rubiaceae, Convolvulaceae, Euphorbiaceae, Amaranthaceae and Verbenaceae with 65, 48, 42, 30, 19, 17, 16, 14, 12, 10 species, respectively