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Titolo:
SIMULATING NITROGEN LOSSES FROM AGRICULTURAL LAND - IMPLICATIONS FOR WATER-QUALITY AND PROTECTION POLICY
Autore:
PARSONS RL; PEASE JW; BOSCH DJ;
Indirizzi:
VIRGINIA POLYTECH INST & STATE UNIV,DEPT AGR & APPL ECON,214A HUTCHESON HALL BLACKSBURG VA 24061
Titolo Testata:
Water resources bulletin
fascicolo: 6, volume: 31, anno: 1995,
pagine: 1079 - 1087
SICI:
0043-1370(1995)31:6<1079:SNLFAL>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MODEL; SOIL;
Keywords:
NITROGEN LOSSES; ANIMAL WASTE; WATER QUALITY; SIMULATION; NONPOINT SOURCE POLLUTION; EPIC; WATER QUALITY POLICIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
R.L. Parsons et al., "SIMULATING NITROGEN LOSSES FROM AGRICULTURAL LAND - IMPLICATIONS FOR WATER-QUALITY AND PROTECTION POLICY", Water resources bulletin, 31(6), 1995, pp. 1079-1087

Abstract

EPIC, a soil erosion/plant growth simulation model, is used to simulate nitrogen losses for 120 randomly selected and previously surveyed cropland sites. Simulated nitrogen losses occur through volatilization,surface water and soil runoff, subsurface lateral flow, and leaching. Physical and crop management variables explain a moderate but significant proportion of the variation in nitrogen losses. Site slope and tillage have offsetting effects on surface and ground water losses. Nitrogen applications in excess of agronomic recommendations and manure obtained off the farm and applied to the sites are significant contributors to nitrogen losses. Farm characteristics such as production of confined livestock, total manure nitrogen available, and farm income per cropland acre explain a relatively large portion of the variability inmanure nitrogen applied to survey sites. The results help to identifyfarm characteristics that can be used to target nutrient management programs. Simulation modeling provides a useful tool for investigating variables which contribute to agricultural nitrogen losses.

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Documento generato il 01/12/20 alle ore 21:24:22