Aproveitamento pelo trigo do nitrogênio residual da crotalária (Crotalaria juncea) e da uréia aplicado ao solo em cultivo precedente

Lange, Anderson; Bologna, Isabela Rodrigues; Faroni, Carlos Eduardo

doi:10.1590/s0103-84782009000600013

Cited by 4 publications

(2 citation statements)

References 16 publications

(3 reference statements)

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“…According to Lange et al (2009), nitrogen mineralization process of C. juncea was slow and represented less than 10% of total N for each year of cultivation. According to Ladd et al (1983), the main benefit of incorporating legumes in the system is longterm by keeping organic nitrogen concentration to ensure future crops.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

Borin¹,

Ferreira²,

Brito³

et al. 2015

Científica

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Section: Resultsmentioning

confidence: 99%

Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

Borin¹,

Ferreira²,

Brito³

et al. 2015

Científica

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“…The values were less than 25% (SEO et al, 2006;AMBROSANO et al, 2011;ARAÚJO et al, 2011;DINIZ et al, 2015), whereas in the soil and the remaining material, higher amounts of N derived from the legume were recovered (ARAÚJO et al, 2005(ARAÚJO et al, , 2011SEO et al, 2006;LANGE et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Changes in the stocks of C and N in organic matter fractions in soil cropped with coffee and fertilized with sunn hemp and ammonium sulfate

Pereira

Neto

Santos

et al. 2018

SCA

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Despite the potential to provide N to crops, the rapid incorporation of green manure nutrients into stable fractions of organic matter in the soil (SOM) may reduce the efficiency of green manuring. Thus, the objective of this work was to characterize the changes of C and N stocks in fractions of SOM cultivated with coffee (Coffea arabica L.) and fertilized with sunn hemp (Crotalaria juncea) and ammonium sulfate. To study the changes in organic C (OC) and total N (TN) in soil and fractions of SOM over time, soil samples were collected in the 0-5 and 5-10 cm layers, with the initial sampling done prior to the application of sunn hemp residues and ammonium sulfate. Five samples were collected every 2 months after the application of the legume and ammonium sulfate. The soil samples were submitted to densimetric and granulometric fractionation, obtaining the free light organic matter (F-LOM), particulate organic matter (POM), and organic matter associated with minerals (MAM). OC and TN stocks were then determined in soil and the SOM fractions. The changes in the stocks of OC (ΔStcC) in the soil in relation to time zero were positive in the evaluations carried out in the two layers. The fractions of SOM showed positive ΔStcC at almost all of the evaluated times. The N supplied to the soil in the form of mineral and organic fertilizer promoted an increase of 0.24 Mg ha -1 of N in the 0-5 cm layer until after 60 days. Of this total, 0.03 Mg ha -1 was associated with F-LOM, 0.07 Mg ha -1 with POM, and the remainder was associated with MAM. Nearly 60% of the N that was supplied to the soil was drawn to the stable fractions of the SOM, indicating a rapid stabilization of this nutrient in the most recalcitrant organic compartments. Despite that, the variations in N stocks of MAM became smaller over time, and eventually became negative, in relation to time zero. This indicates the mineralization of N of this compartment. In the 5-10 cm layer, no effect of time was observed in the soil TN, N-POM, or N-MAM stocks. Additionally, under the conditions of this experiment, the majority of the N supplied to the soil was rapidly incorporated into the most stable fraction of SOM, and this might can reduced the efficiency of the green manuring. ResumoApesar do potencial para fornecer N aos cultivos, a rápida incorporação dos nutrientes do adubo verde em frações estáveis da matéria orgânica do solo (MOS) pode reduzir a eficiência da adubação verde. Portanto, objetivou-se com este trabalho caracterizar as alterações temporais dos estoques de C e N em frações da matéria orgânica de solo cultivado com cafeeiro (Coffea arabica L.) e adubado com crotalária (Crotalaria juncea) e sulfato de amônio. Para estudar o comportamento do C orgânico (CO) e N total (NT) no solo e nas frações da MOS ao longo do tempo, foram coletadas amostras de solo nas camadas de 0-5 e 5-10 cm, sendo a primeira amostragem antes da aplicação dos resíduos de crotalária e sulfato de amônio. Outras cinco amostras foram coletadas a cada dois meses após a aplicação ...

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Enhanced Plant Rooting and Crop System Management for Improved N Use Efficiency

Rosolem

Ritz

Cantarella

et al. 2017

Advances in Agronomy

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Despite the significant inroads into increasing agricultural productivity in recent decades, nitrogen remains a key limiting factor for crop growth and yield. Though highly variable globally, the amount of reactive N added yearly onto cropland that is subsequently lost to the environment remains high. As such the interest in agronomic approaches to address this and improve nitrogen use efficiency (NUE) is currently very high. Here, we have shown the combined approaches of management interventions such as no-till, intercropping with leguminous and grass species, use of nitrogen inhibitors, and combined crop-livestock systems offer considerable potential for enhancing NUE and are already being readily deployed in the tropics. Grass species such as Brachiaria in particular have demonstrated enormous potential via their deep root architectures to reduce losses by leaching. However, the potential for increases in NUE through interaction and association of the root systems with the soil microbial community via rhizodeposits remains a major area for future research. Increasingly it is recognized that truly enhancing NUE requires consideration of the whole system. Improving

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Aproveitamento pelo trigo do nitrogênio residual da crotalária (Crotalaria juncea) e da uréia aplicado ao solo em cultivo precedente

Cited by 4 publications

References 16 publications

Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

Changes in the stocks of C and N in organic matter fractions in soil cropped with coffee and fertilized with sunn hemp and ammonium sulfate

Enhanced Plant Rooting and Crop System Management for Improved N Use Efficiency

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