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| Registros recuperados: 225 | |
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| PETRUCIO,M. M.; ESTEVES,F. A.. |
| The main goal of this research was to quantify the concentrations of total and ammonium N, nitrate, total and soluble P in the water in the presence of Eichhornia crassipes and Salvinia auriculata, which were submitted to two different photoperiods in a 24 hours incubation period in the laboratory. The macrophytes were incubated in plastic vials of approximately 1.5 litters, with a previously prepared solution with NH4NO3, NH4Cl, and KH2PO4. Eichhornia crassipes showed the highest average rate of reduction of all the nutrients analysed in relation to Salvinia auriculata. The largest photoperiod reflected in a higher average rate of reduction of nutrients, in both plants. Therefore, we may expect that in some periods of the year (e.g. summer), the aquatic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eichhornia crassipes; Aquatic macrophytes; Nitrogen; Phosphorus; Salvinia auriculata. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300002 |
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| Bini,Daniel; Santos,Cristiane Alcantara dos; Silva,Mylenne Calcciolari Pinheiro da; Bonfim,Joice Andrade; Cardoso,Elke Jurandy Bran Nogueira. |
| ABSTRACT: Arbuscular mycorrhizal fungi (AMF) are very important to plant nutrition, mostly in terms of acquisition of P and micronutrients. While Acacia mangium is closely associated with AMF throughout the whole cycle, Eucalyptus grandis presents this symbiosis primarily at the seedling stage. The aim of this study was to evaluate the dynamics of AMF in these two tree species in both pure and mixed plantations during the first 20 months after planting. We evaluated the abundance, richness and diversity of AMF spores, the rate of AMF mycorrhizal root colonization, enzymatic activity and soil and litter C, N and P. There was an increase in AMF root colonization of E. grandis when intercropped with A. mangium as well as an increase in the activity of acid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AMF spores; Mycorrhiza; Mixed species; Soil enzymes; Phosphorus. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200102 |
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| Carvalho,CMC; Litz,FH; Fernandes,EA; Silveira,MM; Martins,JM da S; Fonseca,LA; Zanardo,JA. |
| The aim of this study was to evaluate the incidence of footpad dermatitis and quality of broilers litter fed with sorghum grain and diets based in corn. It was used 544 male and female chicks, distributed in a completely randomized design with two treatments and eight replications. The chicken feed was formulated and produced from corn, soybean meal and sorghum grain. In the formulation were kept constant levels of energy and protein in accordance with the following treatments: A. Control (diet based on corn and soybean meal); B. Grain sorghum (Whole Sorghum + soybean meal). At 35 and 42 days were evaluated mineral matter (A %), calcium (Ca%), phosphorus (P%), pH and dry matter (DM %) of the poultry litter. To evaluate the footpad dermatitis were evaluated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Turkey; Enteritis; Viruses; Poults; Diagnosis; Calcium; Environmental impact; Phosphorus. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000300010 |
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| Alfaro,Marta; Salazar,Francisco. |
| In developed countries, intensive grazing has been related to water pollution. The results of several projects carried out on a volcanic soil of the Osorno soil series on beef grazing production systems have shown that grazing management did not increase total nitrogen (N) and phosphorus (P) transfer and losses. Due to the high water infiltration capacity of the soil, runoff was <1% of total drainage, therefore, N and P losses in runoff were small. Nitrogen leaching losses were high (3 up to 71 kg N ha-1 yr-1). Nitrogen loss in runoff was mainly lost as DON (c. 50%) while N leaching losses were mainly as nitrate (c. 70%). Total P losses ranged between 1 and 22 g P ha-1 yr-1 and they increased with increasing field slopes. Phosphorus was mainly lost as... |
| Tipo: Journal article |
Palavras-chave: Nitrogen; Phosphorus; Dairy production; Beef production; Environmental impact. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000200002 |
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| Osei, Edward. |
| Alternative manure application rates represent an integral part of current nutrient management efforts on animal feeding operations (AFOs). Previous studies have indicated that lower manure application rates tend to increase farm production costs. In this study, the Comprehensive Economic and Environmental Optimization Tool - Macro Modeling System (CEEOT-MMS) was used to evaluate the farm-level economic implications of alternative manure application rates for all AFOs in the 48 contiguous states of the U.S. Representative farms derived through statistical disaggregation of national databases and K-means clustering were simulated within the the Farm-level Economic Model (FEM) to determine the economic impacts of four manure application rates. The highest... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: FEM; CEEOT-MMS; Animal feeding operations; Clustering; Costs; Manure; Phosphorus; Crop Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/6240 |
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| Sales,Maykel Franklin Lima; Paulino,Mário Fonseca; Valadares Filho,Sebastião de Campos; Porto,Marlos Oliveira; Couto,Victor Rezende Moreira; Paulino,Pedro Veiga Rodrigues. |
| The objective of this work was to determine macromineral requirements by Zebu steers grazing Brachiaria decumbens supplemented with concentrate. It was used 24 non-castrated steers, at an average age of 7 months and at initial average weight 180 kg. Eight control animals were slaughtered for determining initial body composition. The 16 remaining animals were divided in four four-animal plots, in a complete random design. Each plot received mineral mixture or supplements at the levels 0.75; 1.50 or 2.25 kg/animal/day. The right half-carcass of eight animals, two per group, was dissected in muscle, fat and bones and all body constituents were weighted for determination of empty body weight and body composition. Net requirements of calcium and phosphorus for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium; Nutritional requirement; Phosphorus; Supplementation; Zebu. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200026 |
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| Kerber, Claudia Ehlers. |
| Some of the main equine diseases are related to the musculoskeletal system, mainly during the bone developing in young animals. In São Paulo state, Brazil, the use of tropical grasses for grazing, the seasons and a general tendency to concentrate a large number of horses in small areas, frequently results on bone diseases, sometimes subtle, which depreciate the economic value of the horses and decrease the chance of a maximum performance. An early diagnosis of mineral imbalance play an important role once the bone diseases can be reversible when corrected on time. The author presents a review of physiology and pathophysiology of the bone. Also describe the methods available for diagnostic and suggest the phosphorus clearance as a sensitive, early, low cost... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium; Phosphorus; Clearance; Bone; Equine cálcio; Fósforo; Clearance; Osso; Equinos. |
| Ano: 1999 |
URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/3374 |
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| Registros recuperados: 225 | |
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