Figure 6 - uploaded by Camilo Andrade
Content may be subject to copyright.
Nitrogen content in the biomass and grain along the maize crop cycle. Vertical bars are standard error above and below the average.
Source publication
The proper disposal of pig manure is of great importance because, when mishandled, it can contaminate water resources. This study aimed to evaluate the nitrogen dynamics in a Cerrado Oxisol and its absorption, over time, by a maize crop managed with pig slurry associated with mineral fertilization (N P K). The study was conducted at a private farm,...
Similar publications
It was assumed that the determination of the mineral nitrogen (N<sub>min</sub>) content in the 0.01 mol/L CaCl<sub>2</sub> could rely on measurements of single form NO<sub>3</sub><sup>–</sup>-N, NH<sub>4</sub><sup>+</sup>-N or both, and even including other extractable nutrients. This hypothesis was verified based on some primary data from 17 field...
Management of Quilombola systems are primitive agricultural systems based on the ancestral knowledge of Afro-Brazilian enslaved people. Here, the aim was to understand the impact of these primitive farming methods on the distribution of available nitrogen (N) forms in the soil profile of two Brazilian Cerrado phytophysiognomies. The soil was sample...
The impact of vermicompost application was assessed in one year pot experiment carried out in a
vegetation cage located in the area of the SUA in Nitra. The model crop was grain maize. Treatment 1 was a
non-fertilized treatment. In treatments 2 and 3, vermicompost was applied in autumn at the same dose of 170 kg
ha-1 N. In treatments 4 and 5, vermi...
The proper use of domestic wastewater in agriculture sustains freshwater resources and reduces the need of chemical fertilizers. The objective of this study was to modeling of soil nitrogen dynamics and crop uptake under untreated wastewater application for irrigation taking soil nitrogen cycle into account. A two-dimensional numerical model, HYDRU...
Maize grows in nitrate-dominated dryland soils, but shortly upon localized dressing of nitrogen fertilizers, ammonium is retained as a noticeable form of nitrogen source available to roots. Thus in addition to nitrate, the absorption of ammonium can be an important strategy that promotes rapid plant growth at strong nitrogen demanding stages. The p...
Citations
... Onwonga et al. (2010) also observed the decline in mineral N across all sampling times in all treatments with progression of maize growth. Silva et al. (2012) also concluded that as a result of maize growth and development, the NO 3 --N content decreased rapidly with time reaching minimum at maturity. The reductions in the NO 3 --N occurred from 1 week to 11 week after sowing of maize. ...
... It is evident that plant N content was highest at earlier stages and decreased as plants advanced towards maturity. The decrease in N content with age may be due to dilution effect and translocation from foliage to grains, later on (Yang et al. 2012;Silva et al. 2012). ...
A field experiment was conducted to study the effect of long-term fertilizer management (viz. control, 100% N, 100% NP, 100% NPK and 100% NPK+FYM) on the carbon (C) and nitrogen (N) fractions in
soils under maize-wheat cropping. Soil samples were collected from on-going experiment (started in 1971) during maize growing season in kharif 2011 to discern long-term effect of field treatments on changes in different pools of C and N viz. soil organic C (SOC), water soluble C (WSC) and KMnO4 oxidizable C (KMnO4-C) and ammonical-N (NH4+
-N) and nitrate-N (NO3--N) content. Soil samples were analyzed after1, 3, 5, 7 and 9 weeks interval during maize growth period. The SOC, NO3--N and NH4
+-N concentration increased significantly with combined application of NPK+FYM as compared to the control. The
concentration of SOC increased after 3 weeks, and was reached the highest at harvesting. However, the WSC and KMnO4-C concentration increased up to 5th week after sowing and it decreased afterwards. The NO3--N and NH4+-N concentration decreased with increased maize growth stage, and decreased to the lowest value at harvesting. The dry matter yield of maize at maturity correlated well with SOC, WSC,KMnO4-C, NH4+-N and NO3--N concentration. Crop yield of maize and N uptake increased with NPK+FYMapplication at all growth stages.
... Os analitos avaliados foram Cloreto (Cl -), Nitrito (NO 2 -), Nitrato (NO 3 -), Sulfato SILVA et al., 2012;MAGGI et al., 2011;LI et al., 2008;BOTTO, 2013;YOSHINAGA et al., 2000;ARAÚJO;MONTEIRO;CARDOSO, 2005;PELISSARI et al., 2009;BETTIOL;FERNANDES, 2004). ...
O uso dos resíduos orgânicos na agricultura é uma opção viável do ponto de vista agrícola e econômico em razão da ciclagem de nutrientes. No entanto, questionamentos são efetuados em relação aos impactos ambientais que podem ser gerados. O presente trabalho teve como objetivo quantificar as espécies químicas dos resíduos da suinocultura, da indústria têxtil e da urina humana, na perspectiva de seu reuso como fertilizante na atividade agrícola. Para a determinação das concentrações das espécies químicas, utilizou-se o cromatógrafo de troca iônica aniônica e catiônica e o analisador de carbono orgânico total para as concentrações de carbono das amostras. Os resultados indicaram que os dejetos líquidos suínos (DLS) e a urina humana podem suprir a necessidade de potássio em solos cujo teor de potássio é considerado de valor médio, enquanto o lodo têxtil apresentou valor 9 vezes menor. Para solos com teor muito baixo a aplicação de DLS e urina humana podem ser de 100 m³ ha-1 ano-1, enquanto em solos com teor médio de potássio, o DLS e urina humana tem que ser reduzidos pela metade. No caso do fósforo, a urina humana supre a necessidade quando o teor deste elemento no solo for médio, enquanto no DLS, o valor observado é 20 vezes menor e no lodo têxtil 37 vezes menor. Para atender a necessidade de solos com teor muito baixo, a urina humana pode ser aplicada a 100 m³. ha-1 ano-1, porém o DLS e lodo têxtil não atenderiam esta necessidade.
... Considering the apparent density of the soil of 1.0 kg dm -3 normally observed in the Latossolos of the Cerrado, the treatments that received N via ureas made a stock of around 24 kg ha -1 of mineral N available in each layer evaluated (Fernandes and Fernandes, 2009). This value can be considered significant in the 20 to 40 cm layer since the plant concentrates around 80% of the root system in the first 40 cm of the soil profile (Silva et al., 2012). ...
