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| Litchman, Gennadiy; Nukeshev, Sayahat. |
| The paper studies agricultural crops’ yield depending on quality of entering of mineral fertilizers. It is established that determining average productivity, under square-law dependence of yield on a dose, there is not necessity to set the law of fertilizers distribution across the field and will be sufficient to know expected value D and standard deviation sD. The paper considers approaches to economic-mathematical model of optimization of fertilizers’ doses at the differentiated entering. The produced result provides a new approach to the quality control in technological process of fertilizers application. Also, it allows formulating requirements to perspective technical means used for entering of mineral fertilizers. |
| Tipo: Journal Article |
Palavras-chave: Soil fertility; Mineral fertilizers; Crop yield; Response function; Agribusiness. |
| Ano: 2009 |
URL: http://purl.umn.edu/94557 |
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| Hentz,Paulo; Corrêa,Juliano Corulli; Fontaneli,Renato Serena; Rebelatto,Agostinho; Nicoloso,Rodrigo da Silveira; Semmelmann,Claudio Eduardo Neves. |
| ABSTRACT Organic fertilizers derived from poultry litter and pig slurry are alternatives to mineral fertilizers in increasing soil nutrient availability. The aim of this study was to evaluate soil response, through characterization of organic C and available N, P, and K contents, and corn yield response to increasing amounts of poultry litter, pig slurry, and mineral fertilizers in an integrated crop-livestock production system (ICL) from 2011 to 2013. The experimental design consisted of randomized blocks in a 4 × 3 + 1 factorial arrangement with four replicates. The treatments consisted of four types of fertilizer, two organic (poultry litter and pig slurry) and two mineral, balanced with the same amounts of N, P and K as the organic fertilizers, one of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral fertilizers; Organic carbon; Nitrogen. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100535 |
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