Effect of the Stocking Rate and Land Slope on Nitrogen Losses to Water on a Grazed Pasture of Southern Chile

Salazar, Francisco; Alfaro, Marta; Ledgard, S. F.; Iraira, Sergio; Teuber, Nolberto; Ramírez, Luis

doi:10.4067/s0718-95162011000200009

Cited by 8 publications

(8 citation statements)

References 26 publications

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“…The findings suggest that disturbance reduces nitrogen mineralization, a process occurring in DGS and ADS than CFS because there is low moisture content following the fact that disturbances affect vegetation and thus the land is exposed to solar radiation [32]. These findings agree with other research works that low TN content in DGS (for example), is because livestock grazing decreases the input of organic matter and exposes litter to photo [32,33,34]. Therefore, we establish that photo degradation causes excessive loss of N DGS than in ADS (Golluscio et al 2009).…”

Section: Variation Of Total Nitrogen Across Land Usessupporting

confidence: 89%

Evaluation of Carbon, Nitrogen and Phosphorus in Disturbed and Intact Tropical Coastal Forest Sites in Tanzania

Ligate

Chen

2019

IJPSS

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This study investigated and established the variation of soil nitrogen, total carbon and phosphorus across closed forest; crop-agriculture and livestock disturbed sites. The study provides useful information for local management strategies. It sets initial basic data on the soil status of Uzigua Forest Reserve after 50 years of crop-agriculture and livestock grazing pressure. Forty-seven (50 m × 50 m) quadrats were established on each land uses for soil samples collection. Total nitrogen was analyzed by Kjeldahl acid-digestion, total carbon by the Walkley-Black procedures and phosphorus by Bray-II method. The mean values (percentage) were nitrogen = 16.07 ± 0.34, 1.75 ± 0.25, 6.5 ± 0.20; carbon =14.48 ± 0.23, 11.81 ± 0.13, 12.24 ± 0.30; phosphorus =14.12 ± 6.57, 17.74 ± 3.96, and 13.31± 2.86 for closed forest; agriculture disturbed and grazed sites respectively. There was a slightly lower amount of total carbon on crop agriculture disturbed sites than on the livestock grazed land uses. Carbon-nitrogen ratio was higher in closed forests than in the disturbed sites. The relationship between forest degradation and soil nutrient status is an indication that the below-ground nutrient pools are mainly determined by activities, which disturb the above-ground components mainly vegetation. To restore soil fertility status, it is important to establish the management of the disturbed sites through restoration of vegetation and minimization of disturbances.

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Section: Variation Of Total Nitrogen Across Land Usessupporting

confidence: 89%

Evaluation of Carbon, Nitrogen and Phosphorus in Disturbed and Intact Tropical Coastal Forest Sites in Tanzania

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Chen

2019

IJPSS

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“…These soils are characterized by low nutrient availability, high organic matter content, and the presence of allophane and other minerals which give a low bulk density and high phosphate retention (Matus et al 2008). These soils are not generally prone to leaching in grassland (Alfaro et al 2009;Salazar et al 2011) and crops (Nissen et al 1991). Losses as NO 3 --N measured in a Chilean grassland soil using the ceramic suction cup technique in grazed areas receiving inorganic N fertilizer varied between 8 and 17 kg N ha -1 yr -1 , over 3 yr under a range of stocking rates ).…”

Section: Introductionmentioning

confidence: 99%

Potential mineralization and nitrification in volcanic grassland soils in Chile

Cardenas

Hatch

Scholefield

et al. 2013

Soil Science and Plant Nutrition

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A proportion of the nitrogen (N) applied to grasslands as organic or inorganic fertilizers can be lost to water courses as nitrate and to the atmosphere as nitrous and nitric oxides. Volcanic soils from Chile are not generally prone to leaching, possibly due to net immobilization of nitrate and/or ammonium, and/or due to inhibition of nitrification by either chemical or physical processes. In laboratory studies we found large mineralization potentials in soils from three different Chilean soils after 17 weeks of incubation, totalling 215 and 254 mg kg -1 dry soil for two Andisols and 127 mg kg -1 dry soil in an Ultisol. Nitrification occurred after a short period, and was lowest in the Ultisol. In addition, microbial analysis showed nitrifiers to be present in all three soils. Adsorption of ammonium was two-fold stronger than for nitrate, ranging from 29 to 180 kg N ha ), but was similar in both Andisols (193 and 172 kg N ha -1 , respectively). The combination of ammonium retention together with delayed nitrification could account for the low leaching rates in these soils.

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“…Therefore, a crop's N supply should be synchronized to its demand. N losses are observed in every type of soil and management of such losses should always be a top priority when considering the study of N supply to crops (Salazar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Integrated effect of different N-fertilizer rates and bioslurry application on growth and N-use efficiency of okra (Hibiscus esculentus L.)

Shahbaz¹,

Akhtar²,

Ahmed³

et al. 2014

Turk J Agric For

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Bioslurry obtained from biogas plants has the potential to reduce the use of expensive chemical fertilizers and increase yields. A field experiment was conducted to investigate the growth response and yield production of okra fertilized with various combinations of bioslurry and nitrogen fertilizer. The experiment was planned according to randomized complete block design with 3 replications. Bioslurry was analyzed for its composition and was applied at the rate of 600 kg ha -1 along with 50%, 75%, and 100% of the recommended dose of N fertilizer for the production of okra. Phosphorus and potassium fertilizers were added according to recommended rates per hectare. Compared to inorganic N alone, the application of bioslurry alongside NPK fertilizers applied at reduced rates significantly increased the okra fruit yield as a consequence of 14%-31% enhanced plant height, 12%-14% additional branches per plant, and 25%-36% more fruits per plant. Moreover, bioslurry improved root length by 13%-45%, which resulted in an increased N uptake by plants and improved N use efficiency. Our results suggest that the application of bioslurry alongside reduced rates of N fertilizer is a viable strategy for the sustainable production of okra, especially under semiarid climatic conditions.

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Effect of the Stocking Rate and Land Slope on Nitrogen Losses to Water on a Grazed Pasture of Southern Chile

Cited by 8 publications

References 26 publications

Evaluation of Carbon, Nitrogen and Phosphorus in Disturbed and Intact Tropical Coastal Forest Sites in Tanzania

Evaluation of Carbon, Nitrogen and Phosphorus in Disturbed and Intact Tropical Coastal Forest Sites in Tanzania

Potential mineralization and nitrification in volcanic grassland soils in Chile

Integrated effect of different N-fertilizer rates and bioslurry application on growth and N-use efficiency of okra (Hibiscus esculentus L.)

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