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| Petry,Mirta T.; Basso,Laudenir J.; Carlesso,Reimar; Armoa,Maria S.; Henkes,Jonas R.. |
| ABSTRACT Evaluating the impacts of water stress on crop yield allows comparing irrigation management alternatives, aiming to ensure an economic return for the irrigated farms. Thus, the main objectives of this study were to model the soil water balance, deriving the crop coefficients, grain yield prediction, and economic return of soybean grown at different levels of water deficit and price quotations. The experiment was carried out under a rainout shelter, using four irrigation water managements. Irrigations were applied when the soil available water in the root zone reached 75%, 64%, 60%, and 50% of the total available water (TAW). Crop and soil parameters were monitored throughout the crop season. The SIMDualKc model was used to simulate the soil water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Soil water balance; SIMDualKc model; Economic return. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400526 |
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| Bernardi,Alberto Carlos de Campos; Tupy,Oscar; Santos,Karoline Eduarda Lima; Mazzuco,Giulia Guillen; Bettiol,Giovana Maranhão; Rabello,Ladislau Marcelino; Inamasu,Ricardo Yassushi. |
| Abstract: The objective of this work was to evaluate the spatial and temporal variability of the dry matter yield of irrigated corn for silage, as well as its economic return. The study was conducted in an irrigated silage corn field of 18.9 ha in the municipality of São Carlos, in the state of São Paulo, Brazil. The spatial variability of the yield of three crop seasons, normalized yield indexes, production cost, profit, and soil electrical conductivity (EC) were modeled using semivariograms. Yield maps were obtained by kriging, and management zones were mapped based on average yield, normalized index, and EC. The results showed a structured spatial variability of corn yield, production cost, profit, and soil EC within the irrigated area. The adopted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Economic return; Management zones; Soil electrical conductivity; Temporal stability; Yield maps. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201289 |
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| Bessa Junior,Ambrosio Paula; Azevedo,Celicina Maria da Silveira Borges; Pontes,Frederico Silva Thé; Henry-Silva,Gustavo Gonzaga. |
| This study aimed to evaluate the productivity, growth performance and economic feasibility of polyculture of Nile tilapia Oreochromis niloticus and shrimp Litopenaeus vannamei at different stocking densities. Feed was provided based on fish requirements. The experiment was conducted at the Aquaculture facility of the Universidade Federal Rural do Semi-Árido - UFERSA, in a completely randomized design with five treatments and four replicates each. Treatments consisted of a tilapia monoculture with 2 tilapias.m-2; and polyculture with 2 tilapias.m-2 and L. vannamei at four different densities (3, 6, 9 and 12 shrimps.m-2). The initial individual biomass for fish and shrimp were 1.23±0.12 g and 0.133±0.009 g, respectively. Water quality parameters,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Economic return; Growth performance; Sustainability. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700002 |
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