Chioderoli C.A.,Sao Paulo State University |
de Mello L.M.M.,Sao Paulo State University |
de Holanda H.V.,Curso deAgronomia |
Furlani C.E.A.,FCAV |
And 3 more authors.
Ciencia Rural | Year: 2012
An alternative to supply the annual input of straw required to maintain the no-tillage system (SPD) in the tropics is the cultivation of maize intercropped with Urochloa. In order to identify the best cropping system of two forage species (Urochloa brizantha and Urochloa ruzizienses) intercropped with maize (Zea mays L.) in no tillage system, the present study was conducted. Maize was seeded intercropped with forage in five cropping systems. The experimental design was in randomized blocks in factorial scheme (2x4+1) with four replications. There were evaluated: dry mass of maize straw, dry mass of urochloa straw, total dry mass of straw, maize plant population, mass of 1000 grain and grain yield. The results showed that maize intercropped with urochloa had no negative effect on grain yield and increased the input of dry matter in the production system under no-tillage system. The choice of a particular cropping system depends on the management and availability of machines, since all systems showed positive behavior in respect of grain yield and straw production.
de Souza H.A.,CNPC |
Romualdo L.M.,University of Sao Paulo |
Idesia | Year: 2012
A better understanding of the differences between the levels of nutrients, depending on the type of pruning used in the cultivation of the guava tree, may allow a more adequate understanding of the physiological processes of this fruit. The analysis of flowers is a tool that can be used to assist in assessing the nutritional status of crops, especially perennials. We evaluated the effects of different types of pruning on nutrient concentrations in flowers and fruit, at different developmental stages and in different parts of the fruit. The study was carried out in Vista Alegre do Alto, in orchards of guava variety Paluma. Flowers and fruit were collected in orchards, one under heavy pruning and the other with continuous pruning. The fruit were collected in two stages (two millimeters length and mature) and divided into basal part and apex, with the top toward the stalk. Flowers were collected in the same orchards as the fruits, sampling the basal part and apex of the flowers. F tests were performed and, when necessary, the Scott-Knott test at α= 5%. Overall, there were nutritional differences among flowers and fruits in relation to the type of pruning employed; drastic pruning provided higher levels of nutrients compared with continuous pruning. In relation to the portion of the samples, especially for fruit, there were differences between the apex and base, as well as between different stages of fruit collection.
Costa J.P.R.,Sao Paulo State University |
Da Silva W.L.,Sao Paulo State University |
De Paula G.C.,Sao Paulo State University |
Tsuzukibashi D.,Sao Paulo State University |
And 3 more authors.
Semina:Ciencias Agrarias | Year: 2015
In the present study, the effect of grazing intensity (GI) and feed supplementation in sixty-four crossbred Santa Inês lambs was assessed based on performance, blood stress indicators, and metabolic profiles. The GIs analyzed were VH = very high, H = high, L = low, and VL = very low, and were represented by the residual leaf area index (LAIr). The lambs were divided into two groups, supplemented (SP) and non-supplemented (NSP). The dry matter intake (DMI) and average daily gain (ADG) increased linearly with decreasing GI (P < 0.05), and the ADG was higher for the NSP group than the SP group (P < 0.05). The plasma cortisol concentration was higher in the NSP group (P < 0.05), and it was not affected by GIs (P > 0.05). The neutrophil:lymphocyte (N:L) ratio decreased linearly with GI (P < 0.05), and the SP group had a higher N:L ratio (P < 0.05). None of the parameters evaluated for protein metabolism were affected by GI (P > 0.05), except albumin, where the SP group had a higher concentration of this metabolite (P < 0.05). Regarding energy metabolism indicators, glucose showed a linear increase with a decrease in GI (P < 0.05) and was higher in the SP group (P < 0.05); however, there was a decreasing linear effect (P < 0.05) and the NSP group had higher serum levels (P < 0.05) of non-esterified fatty acids (NEFA). The concentration of beta hydroxybutyrate (HBA-B) was higher in the SP group (P < 0.05). The concentration of calcium was affected by GI (P < 0.05). The phosphorus concentration was higher in the SP group (P < 0.05), and concentration of magnesium was not affected by any of the treatments (P > 0.05). It was concluded that GI and SP modified the performance, stress indicators, and metabolic profiles of finishing lambs.
Decaro Junior S.T.,FCAV |
Ferreira M.D.C.,FCAV |
Lasmar O.,Lavras MG
Engenharia Agricola | Year: 2015
The physical characteristics of a spray liquid are important in getting a good droplet formation and control efficiency over a particular target. As a function of these characteristics, it is possible to decipher which is the best adjuvant based on the respective concentration used during the spray. Therefore, ten spraying liquids were prepared, which varied in concentrations of pesticide lufenuron + profenofos, mineral oil, water and manganese sulfate. Pendant droplets formed from these mixtures were measured to examine their impact on surface tension. Droplets were applied to the surface of coffee leaves and the surface tension, contact angle formed and the leaf area wetted by the droplet, were measured. A smooth glass surface was taken as a comparative to the coffee leaves. The highest concentrations of oil resulted in lower surface tension, smaller contact angles of droplets on leaf surfaces and larger areas wetted by the droplets. Both surfaces showed hydrophilic behavior.