Nitrogen recovery efficiency for corn intercropped with palisade grass

Almeida, Rodrigo Estevam Munhoz de; Favarin, José Laércio; Otto, Rafael; Franco, Henrique Coutinho Junqueira; Reis, André Froes Borja; Moreira, Lílian Angélica

doi:10.1590/1678-4499.2017242

Cited by 5 publications

(7 citation statements)

References 39 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value was over 80% when it was supplied only for Urochloa (Pedrosa, 2013). In the corn-Urochloa intercrop, the recovery of N in fertilizer was higher than in corn monoculture (Almeida et al, 2018d) and the greater recovery in soil profiles between 0.6 and 1.0 m was probably related to Urochloa roots reaching deep layers, thus reducing N-losses by leaching. Reduced leaching might as well be attributed to the BNI promoted by Urochloa root exudation (Karwat et al, 2018).…”

Section: N Cyclingmentioning

confidence: 90%

“…To guarantee no corn yield loss, forage growth must be partially suppressed to reduce competition for water, light, nutrients and space with corn; consequently, corn gains a competitive advantage over the forage, which can lead to normal growth, development and production during the intercrop without compromising forage production afterwards (Ceccon et al, 2013;de Oliveira et al, 2019). Broadcasting Urochloa before/after corn can be a way to reduce its growth (Ceccon et al, 2013) and the use of lower herbicide rates is also recommended for this aim (Almeida et al, 2018d;de Oliveira et al, 2019). In this case, nicosulfuron (2-[[[[(4, 6-…”

Section: Urochloa In Tropical and Subtropical Conservation Agriculturementioning

confidence: 99%

“…is the most used herbicide to suppress Urochloa growth in intercropping systems (Almeida et al, 2018d;de Oliveira et al, 2019). According to Anésio et al (2017), applying nicosulfuron to Urochloa at a lower rate affords the suppression needed, without killing it.…”

Section: Urochloa In Tropical and Subtropical Conservation Agriculturementioning

confidence: 99%

See 2 more Smart Citations

Urochloa in Tropical Agroecosystems

Baptistella¹,

Andrade

Favarin³

et al. 2020

Front. Sustain. Food Syst.

Self Cite

View full text Add to dashboard Cite

Increasing biodiversity is an important issue in more secure and sustainable agriculture. Diversified systems are more resilient to climate change, environmental stresses and enhance soil health, nutrient cycling and nutrient use efficiency. In tropical agroecosystems, cover crops and intercrops are an alternative toward a more diverse and sustainable production. Urochloa spp. (syn. Brachiaria spp.) are perennial grasses, known for their high biomass production. They are commonly used as cover and companion crops in conservation agriculture in the tropics and the residues left in the field after cutting protect the soil and provide nutrient to the next crop cycle or intercropped culture. Urochloa species roots are vigorous, abundant and deep, as opposed to the more shallow and scarce roots of common crops. These traits contribute to carbon sequestration, soil organic matter stabilization and nutrient cycling. Urochloa roots also improve soil physical characteristics and influence soil nutrient dynamics, reducing nutrient losses and enhancing cycling, what is key to achieve greater nutrient use efficiency in agriculture. For instance, Urochloa root exudates can reduce nitrogen losses by denitrification and leaching through a process called biological nitrification inhibition; root exudates can mobilize recalcitrant phosphorus from soils and make it available for plant uptake; the deep roots of these grasses have the potential to recover nutrients that are virtually lost away from the root zone of other crops. This review compiles scientific progress regarding the introduction of Urochloa in agroecosystems, mainly on the aspects related to the contribution to more secure and sustainable agriculture.

show abstract

Section: N Cyclingmentioning

confidence: 90%

Section: Urochloa In Tropical and Subtropical Conservation Agriculturementioning

confidence: 99%

See 1 more Smart Citation

Urochloa in Tropical Agroecosystems

Baptistella¹,

Andrade

Favarin³

et al. 2020

Front. Sustain. Food Syst.

Self Cite

View full text Add to dashboard Cite

show abstract

“…are the most cultivated forage in the tropics (Dias‐Filho, 2016) serving traditionally as pasture for cattle. Urochloa has also been used in agroecosystems as an alternative to crop rotation in no‐tillage systems and as a companion crop in intercrops with annual and perennial species, serving both as a cover crop and pasture, especially in Brazil (Bieluczyk et al, 2020; de Almeida, Favarin, et al, 2018; Favarin, de Souza, Moscardini, & Baptistella, 2018). Introduction of Urochloa in the agroecosystem can provide multiple services, such as erosion control, soil aggregation, carbon sequestration, increased water availability, nutrient cycling and nutrient use efficiency (NUE; Baptistella, de Andrade, Favarin, & Mazzafera, 2020).…”

Section: Introductionmentioning

confidence: 99%

Differential responses of three Urochloa species to low phosphorus availability

Baptistella

Llerena

Domingues-Júnior

et al. 2021

Annals of Applied Biology

Self Cite

View full text Add to dashboard Cite

Urochloa (syn. Brachiaria spp.) is the most cultivated forage species in the tropics and is being introduced to agroecosystems as it can provide multiple services, such as nutrient cycling. In this regard, phosphorus (P) cycling has received particular attention for its little availability in soils and the fact that Urochloa has mechanisms to cope with its low availability. However, there are interspecific differences regarding adaptation to low fertility and P requirements among Urochloa species. This study aimed to evaluate the responses of three Urochloa species—Urochloa brizantha, Urochloa decumbens and Urochloa ruziziensis—to low P availability, as well as their mechanisms to grow on these conditions. We conducted a hydroponic experiment with three levels of P availability—10% (6.2 mg P dm−3), 25% (15.5 mg P dm−3) and 100% (62 mg P dm−3)—and evaluated plant biomass production, P tissue concentration, root acid phosphatase activity, root exudation and P transporter expression on roots. We identified several metabolites in root exudates including amino acids, non‐protein amino acids, polyamides, organic acids and phenolic acids. Although all metabolites were found in all the species, metabolite exudation varied among species and P level. Overall, U. brizantha and U. ruziziensis plants exudated more metabolites when growing under P limitation (10 and 25% P), which can be a response to low P availability and stress. We identified three P transporters in roots from the PHT1 family—UPHT1;1a, UPHT1;1b and UPHT1;1c. We did not find an explicit expression pattern for UPHT1;1a, but the expression of UPHT1;1b and UPHT1;1c increased at low P availability. U. ruziziensis accumulated more biomass than the other species at all levels of P availability, possibly because of the greater expression of these P transporters. Urochloa species differ regarding nutrient availability requirements, including P, which may explain the P transporters expression and metabolite exudation results. Thus, to cope with low P in the soil, the species developed different metabolic strategies to improve the uptake of this nutrient.

show abstract

“…Normally, corn/forage intercropping is installed in the second season, when forage biomass increases the straw mulching formation after corn harvest to protect the soil. Therefore, this system makes it possible the cover soil in the off-season period, providing a conservationist tool to the no-tillage cropping or to produce the food grazing animals (Almeida et al, 2018).…”

Section: Introductionmentioning

confidence: 99%