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Search Results: 1 - 10 of 174556 matches for " Hermano Vaz de; "
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Correla??o entre o pêso da planta e o das sementes, em variedades de feijoeiros
Arruda, Hermano Vaz de;
Bragantia , 1957, DOI: 10.1590/S0006-87051957000100026
Abstract: taking the weight of the whole plants (x) as representative of the vegetative vigor and the weight of seeds (y), we determined the regression b = 0.34. this coefficient proved to be highly significative in the statistical analysis, showing the existence of correlation between both the variables and that to a variation of 1 kg in the weight of the plants corresponds a variation of 0.34 kg in the seeds.
Eficiência do delineamento em blocos ao acaso, em experiências comparativas de variedades e híbridos de milho
Arruda, Hermano Vaz de;
Bragantia , 1954, DOI: 10.1590/S0006-87051954000100018
Abstract: fifty four experiments designed to test corn varieties and hybrids were carried out in nine experiment stations of the instituto agron?mico de campinas from 1943 to 1954. two types of analysis were made with data obtained from these experiments : first, they were analysed as from randomized block experiments ; second, as from completely randomized designs. randomized blocks were 30 per cent more effective than completely randomized designs. this result indicates that a randomized block experiment with six replications offers as much precision as that obtained with eight replications in the latter design. a mean coefficient of variation of 16.1 was found. the experiments carried out at the experiment stations of ribeir?o prêto, tietê, ipanema, and cap?o bonito had the highest coefficients of variation.
Aduba??o nitrogenada do milho
Arruda, Hermano Vaz de;
Bragantia , 1959, DOI: 10.1590/S0006-87051959000100012
Abstract: this paper reports the results of two experiments earned out in ribeir?o prêto experiment station to study the effects of two nitrogen fertilizers, chilean nitrate and ammonium sulfate on corn yield. the levels of n used were 80 and 160 kg per hectare applied as side-dressing at 30, 60 and 80 days after the germination. the types and levels of n were compared in presence of pk that were applied in the furrow at planting time, respectively as superphosphate and potassium chloride, both in the amount of 80 kg per hectare. two other treatments, no fertilizer and pk alone were included as controls. the results indicated that the application of pk increased the yield in 50% in relation to the check. no differences were found between types and levels of n. both levels of n increased the yield in 33% when compared with that of the pk treatment.
Efeitos de inseticidas e acaricidas em cultura de feij?o
Arruda, Hermano Vaz de;
Bragantia , 1960, DOI: 10.1590/S0006-87051960000100015
Abstract: two spraying experiments were carried out at the ribeir?o prêto agr. exp. sta. aiming at the control of insect pests and mites that affect the bean crop. endrim and diazinon gave good insect and mite control and increased the yields significantly when compared with the controls in the first trial. in the second test the systemic pesticides, sistox and metasistox gave the best insect and mite control and the highest yields.
Emprêgo de bordaduras em experimentos de aduba??o do milho
Arruda, Hermano Vaz de;
Bragantia , 1961, DOI: 10.1590/S0006-87051961000100023
Abstract: according to the. established technique cach plot in a fertilizer experiment should be protected by guard rows, i.e., by rows that receive the same treatment of the effective plot unit, but are not utilized for observations and harvest. as this technique increases the field work there is a tendency for simplifying it by using, for instance, only one unfertilized row between the adjacent effective plot units. the author studied the viability of the last technique in two fertilizer trials with corn and verified that the yields of the separating (unfertilized) rows increased as the doses of nitrogen applied to the adjacent effective plots were increased, what seems to indicate that these plots were deprived of corresponding quantities of the nutrient in question. in another experiment with corn, in which the established technique was used, the yields of the guard rows were larger than those of the effective plot units, whereas the response to nitrogen was much smaller in the former than in the latter. from lhe results of these experiments the author concluded that at least when studying the effect of nitrogen the simplified teclunique should not be used.
S?bre a necessidade de fileiras de bordadura, em experiências de campo
Arruda, Hermano Vaz de;
Bragantia , 1959, DOI: 10.1590/S0006-87051959000100008
Abstract: a been variety trial was used by the author to investigate the problem as to whether or not it is necessary to use guard rows for this type of experiments. the inner rows and the guard rows of each plot of the experiment, were harvested separately and statistical analysis was carried out on their separate yields and also on that of the plot as a whole. a satisfactory agreement was found between the f values and the coefficients of variation for the inner rows, for the guard rows, and for the whole plot. an f-test on the yield differences between central rows and guard rows of each plot was made and found not to be significant. also, the correlation between the yields of the inner rows and the guard rows was very high. based on the results of this investigation, the author suggests that guard rows in bean variety trials should be used only when the possibility of strong competition betweetn adjacent rows of different varieties is suspected.
Lixo fermentado pelo processo Verdier-Grué, na aduba??o de alface
Alves, Sebasti?o;Arruda, Hermano Vaz de;
Bragantia , 1960, DOI: 10.1590/S0006-87051960000100005
Abstract: two levels (8 and 12 kg per sq.m.) of processed garbage were compared with one level (8 kg per sq.m.) of stable manure in presence and in absence of chemical fertilizers. in absence af chemical fertilizers there was no significant difference in yield between lettuce plots receiving 8 kg of manure and 12 kg af processed garbage per square meter; both treatments were significantly better than processed garbage at the rate of 8 kg per square meter. when chemical fertilizers were added, this difference was smaller, but still significant. the results or the experiment indicate that garbage processed by the verdier-grué method can replace stable manure in the fertilization of lettuce when used in amounts 1.5 times larger.
Frutifica??o no cafeeiro
Reis, A. Junqueira;Arruda, Hermano Vaz de;
Bragantia , 1956, DOI: 10.1590/S0006-87051956000100009
Abstract: determinations of fruit setting were made in a fertilizer trial that is being carried out at the esta??o experimental de ribeir?o prêto. this experiment is a factorial 24 with four replications, the basic treatments being 10 kg of "estêrco" (e), 0.2 kg of ammonium sulphate (n), 0.2 kg of bone meal (p) and 0.1 kg of potassium chloride (k). fruits were counted in november of 1953 and 1954, soon after flowering, and also in february of the following years, when the fruits were already well developed. by fruit setting it is meant the ratio between fruit numbers in november and february, although counting was made at 15-day intervals between these two dates. in 1953/54 the percentage of fruit setting was determined for one plant in each of the four replications of treatments e, en, ep and ek. one plant in each replication of treatments np, en, enk and enpk was studied in 1954/55. for each plant in both seasons, six flowering branches were used, two at the higher part of the coffee plant, two at the base and two in intermediate positions. from the results obtained it is concluded that chemical fertilizers may contribute significantly to increase the percentage of fruit setting. together with "estêrco" (stable manure), phosphorus showed a 3.5 per cent increase over "estêrco" alone. comparing treatments with and without potash an increase of 8.1 per cent was found for plots receiving this fertilizer in 1954/55. it is also concluded that significant differences were observed in fruit setting at different levels of the plant, in favor of the higher branches. fruit setting showed no correlation with total yield of ripened fruits.
Contr?le do tripes causador do prateamento das f?lhas do amendoim, por meio de inseticidas
Almeida, Pedro Rodrigues de;Arruda, Hermano Vaz de;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100039
Abstract: three experiments were conducted in three consecutive years at the ribeir?o prêto agricultural experiment station for studying the control of the tobacco thrips on peanut. the insecticides tested were aldrim, ddt, diazinon, disiston, endrim, epn, gusation, rhodiatox, and thimet. the results from the experiments indicated that all the insecticides tried were equally effective for the control of the insect. on the average the insecticidal treatments increased the yield 45 per cent.
Efeito do preparo do solo na produ??o de milho
Aloisi Sobrinho, Jo?o;Arruda, Hermano Vaz de;
Bragantia , 1960, DOI: 10.1590/S0006-87051960000100014
Abstract: two methods of preparing the soil for the corn crop were tested in three consecutive years at the pindorama agric. exp. sta., s?o paulo. the two methods consisted of plowing the land, followed by harrowing compared with the superficial preparation of the soil with the hand hoe, so as to destroy the weeds without breaking up the upper soil layers. the statistical analysis of the results from the three crops indicated that the machine preparation of the seed bed for corn was significantly better than the other method, yielding on the average 30 per cent more. in addition to giving higher yields, the use of machines made the soil preparation cheaper than when it was done with the hand hoe.
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