Retention, Accumulation, and Movement of Phosphorus in a Mollisol Soil Irrigated With Dairy Effluent in a Tropical Environment

Valencia-Gica, Rowena B.; Yost, Russell S.; Porter, Guy S.; Pattnaik, R.

doi:10.1097/ss.0b013e3181f79669

Cited by 3 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One potential candidate species is napiergrass, a warm-season perennial C4 grass of African origin that produces high biomass yields under tropical conditions. In recent studies, napiergrass produced more than 45 Mg dry wt ha −1 year −1 in Florida [ 30 ] and between 40 and 53 Mg dry wt ha −1 year −1 in Hawaii [ 31 , 32 ]. In contrast to sugarcane production in Hawaii, napiergrass is a ratoon-harvested crop that maintains high yields with zero-tillage management and no pre-harvest burning.…”

Section: Methodsmentioning

confidence: 99%

Carbon budgets of potential tropical perennial grass cropping scenarios for bioenergy feedstock production

Pawlowski

Meki

Kiniry

et al. 2018

Carbon Balance Manage

View full text Add to dashboard Cite

BackgroundThe environmental costs of fossil fuel consumption are globally recognized, opening many pathways for the development of regional portfolio solutions for sustainable replacement fuel and energy options. The purpose of this study was to create a baseline carbon (C) budget of a conventionally managed sugarcane (Saccharum officinarum) production system on Maui, Hawaii, and compare it to three different future energy cropping scenarios: (1) conventional sugarcane with a 50% deficit irrigation (sugarcane 50%), (2) ratoon harvested napiergrass (Pennisetum purpureum Schumach.) with 100% irrigation (napier 100%), and (3) ratoon harvested napiergrass with a 50% deficit irrigation (napier 50%).ResultsThe differences among cropping scenarios for the fossil fuel-based emissions associated with agricultural inputs and field operations were small compared to the differences associated with pre-harvest burn emissions and soil C stock under ratoon harvest and zero-tillage management. Burn emissions were nearly 2000 kg Ceq ha−1 year−1 in the conventional sugarcane; whereas soil C gains were approximately 4500 kg Ceq ha−1 year−1 in the surface layer of the soil profile for napiergrass. Further, gains in deep soil profile C were nearly three times greater than in the surface layer. Therefore, net global warming potential was greatest for conventional sugarcane and least for napier 50% when deep profile soil C was included. Per unit of biomass yield, the most greenhouse gas (GHG) intensive scenario was sugarcane 50% with a GHG Index (GHGI, positive values imply a climate impact, so a more negative value is preferable for climate change mitigation) of 0.11 and the least intensive was napiergrass 50% when a deep soil profile was included (GHGI = − 0.77).ConclusionFuture scenarios for energy or fuel production on former sugarcane land across the Pacific Basin or other volcanic islands should concentrate on ratoon-harvested crops that maintain yields under zero-tillage management for long intervals between kill harvest and reduce costs of field operations and agricultural input requirements. For napiergrass on Maui and elsewhere, deficit irrigation maximized climate change mitigation of the system and reduced water use should be part of planning a sustainable, diversified agricultural landscape.

show abstract

Section: Methodsmentioning

confidence: 99%

Carbon budgets of potential tropical perennial grass cropping scenarios for bioenergy feedstock production

Pawlowski

Meki

Kiniry

et al. 2018

Carbon Balance Manage

View full text Add to dashboard Cite

show abstract

“…Tropical sugarcane dry biomass yields may range from 25.9 Mg ha -1 yr -1 in Brazil to 40 Mg ha -1 year -1 in Hawaii [12,13]. Napiergrass, another African origin warm-season perennial grass has been found to produce more than 45 Mg ha -1 year -1 in Florida and, similarly, between 40 and 53 Mg ha -1 year -1 in Hawaii [7,14,15]. However, under optimal conditions dry matter yields as high as 88 Mg ha -1 year -1 have been recorded in El Salvador [7,16].…”

Section: Introductionmentioning

confidence: 99%

Field-Based Estimates of Global Warming Potential in Bioenergy Systems of Hawaii: Crop Choice and Deficit Irrigation

et al. 2017

View full text Add to dashboard Cite

Replacing fossil fuel with biofuel is environmentally viable from a climate change perspective only if the net greenhouse gas (GHG) footprint of the system is reduced. The effects of replacing annual arable crops with perennial bioenergy feedstocks on net GHG production and soil carbon (C) stock are critical to the system-level balance. Here, we compared GHG flux, crop yield, root biomass, and soil C stock under two potential tropical, perennial grass biofuel feedstocks: conventional sugarcane and ratoon-harvested, zero-tillage napiergrass. Evaluations were conducted at two irrigation levels, 100% of plantation application and at a 50% deficit. Peaks and troughs of GHG emission followed agronomic events such as ratoon harvest of napiergrass and fertilization. Yet, net GHG flux was dominated by carbon dioxide (CO2), as methane was oxidized and nitrous oxide (N2O) emission was very low even following fertilization. High N2O fluxes that frequently negate other greenhouse gas benefits that come from replacing fossil fuels with agronomic forms of bioenergy were mitigated by efficient water and fertilizer management, including direct injection of fertilizer into buried irrigation lines. From soil intensively cultivated for a century in sugarcane, soil C stock and root biomass increased rapidly following cultivation in grasses selected for robust root systems and drought tolerance. The net soil C increase over the two-year crop cycle was three-fold greater than the annualized soil surface CO2 flux. Deficit irrigation reduced yield, but increased soil C accumulation as proportionately more photosynthetic resources were allocated belowground. In the first two years of cultivation napiergrass did not increase net greenhouse warming potential (GWP) compared to sugarcane, and has the advantage of multiple ratoon harvests per year and less negative effects of deficit irrigation to yield.

show abstract

“…The experimental site was in Waianae (21°26′N/158°10′W), O’ahu, Hawaii, with a mean elevation of 2·4 m above sea level and average monthly ET p ranging from 5 to 21 mm d −1 , varying with season. Rainfall is very low (150 mm annually), and the ET p is, thus, high compared with other locations on the island (Valencia‐Gica et al. , 2010).…”

Section: Methodsmentioning

confidence: 88%

“…The number of replications was limited by land availability and to provide more robust data on repeated measurement of forage and soil properties over time. Additional information on experimental design and properties of dairy effluent was presented in an associated article (Valencia‐Gica et al. , 2010).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Biomass production and nutrient removal by tropical grasses subsurface drip‐irrigated with dairy effluent

Valencia-Gica

Yost

Porter

2012

Grass and Forage Science

View full text Add to dashboard Cite

Effluent lagoons on dairy farms can overflow and potentially pollute adjacent land and associated water bodies. An alternative solution to effluent disposal is needed by dairy operators in island environments. An attractive win-win alternative is to recycle nutrients from this resource through effluent irrigation for forage grass production that minimizes environmental pollution. This study assessed biomass production and nutrient removal by, and high application rates to, tropical grasses that were subsurface drip-irrigated with dairy effluent. Four grass species -Banagrass (Pennisetum purpureum K. Schumach.), California grass (Brachiaria mutica (Forssk.) Stapf.), Stargrass (Cynodon nlemfuensis Vanderyst) and Suerte grass (Paspalum atratum Swallen) -were subsurface (20-25 cm) dripirrigated with effluent at two rates based on potential evapotranspiration (ET p ) at the site (Waianae, Hawaii) )2AE0 ET p (16 mm d )1 in winter; 23 mm d )1 in summer) and 0AE5 ET p (5 mm d )1 in winter; 6 mm d )1 in summer). Treatments were arranged in an augmented completely randomized design. Brachiaria mutica and P. purpureum had the highest dry-matter yield (43-57 t ha )1 year )1 ) and nutrient uptake especially with the 2AE0 ET p irrigation rate (1083-1405 kg ha )1 year )1 N, 154-164 kg ha )1 year )1 P, 1992-2141 kg ha )1 year )1 K). Average removal of nutrients by the grasses was 25-94% of the applied nitrogen, 11-82% of phosphorus and 2-13% of the potassium. Average values of crude protein (90-160 g kg )1 ), neutral detergent fibre (570-620 g kg )1 ) and acid detergent fibre (320-360 g kg )1 ) were at levels acceptable for feeding to lactating cattle. Results suggest that P. purpureum and B. mutica irrigated with effluent effectively recycled nutrients in the milk production system.

show abstract

Retention, Accumulation, and Movement of Phosphorus in a Mollisol Soil Irrigated With Dairy Effluent in a Tropical Environment

Cited by 3 publications

References 27 publications

Carbon budgets of potential tropical perennial grass cropping scenarios for bioenergy feedstock production

Carbon budgets of potential tropical perennial grass cropping scenarios for bioenergy feedstock production

Field-Based Estimates of Global Warming Potential in Bioenergy Systems of Hawaii: Crop Choice and Deficit Irrigation

Biomass production and nutrient removal by tropical grasses subsurface drip‐irrigated with dairy effluent

Contact Info

Product

Resources

About