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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Article de revue

Evaluation of precision land leveling and double zero-till systems in the rice-wheat rotation: Water use, productivity, profitability and soil physical properties  [2009]

Jat, M.L.; Gathala, M.K.; Ladha, J.K.; Saharawat, Y.S.; et al.

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In recent years conventional production technologies in the rice-wheat (RW) system have been leading to deterioration of soil health and declining farm profitability due to high inputs of water and labour. Conservation agriculture (CA)-based resource-conserving technologies (RCTs) vis-à-vis zero-till (ZT), raised-bed planting and direct-seeded rice (DSR) have shown promise as alternatives to conventional production technologies to overcome these problems. The integration of CA-based RCTs with precision agriculture (PA)-based technologies in a systems perspective could provide a better option for sustainable RW production systems. In this study we attempted to evaluate conservation and precision agriculture (CPA)-based RCTs as a double-ZT system integrated with laser-assisted precision land leveling (PLL) in the RW system. A field experiment was conducted in the western IGP for 2 years to evaluate various tillage and crop establishment methods under PLL and traditional land leveling (TLL) practices to improve water productivity, economic profitability and soil physical quality. Irrespective of tillage and crop establishment methods (TCE), PLL improved RW system productivity by 7.4% in year 2 as compared to traditional land leveling. Total irrigation water savings under PLL versus TLL were 12-14% in rice and 10-13% in wheat. PLL improved RW system profitability by US$113ha⁻¹ (year 1) to $175ha⁻¹ (year 2). Yields were higher in conventionally transplanted ric
e followed by direct-drill-seeded rice after ZT. In wheat, yields were higher in ZT when followed by DSR than in the conventional-till (CT) system. RW system productivity under double ZT was equivalent to that of the conventional method. Among different TCE, conventional puddled-transplanted rice-CT wheat required 12-33% more water than other TCE techniques. Compared with CT systems, double ZT consumed 12-20% less water with almost equal system productivity and demonstrated higher water productivity. The CT system had higher bulk density and penetration resistance in 10-15 and 15-20cm soil layers due to compaction caused by the repeated wet tillage in rice. The steady-state infiltration rate and soil aggregation (>0.25mm) were higher under permanent beds and double ZT and lower in the CT system. Under CT, soil aggregation was static across seasons, whereas it improved under double no-till and permanent beds. Similarly, mean weight diameter of aggregates was higher under double ZT and permanent beds and increased over time. The study reveals that to sustain the RW system, CPA-based RCTs could be more viable options: however, the long-term effects of these alternative technologies need to be studied under varying agro-ecologies.
(Revue
Soil & tillage research
ISSN : 0167-1987

Information bibliographique

Langue:
English
Type:
Journal Article
Sur AGRIS depuis:
2013
Volume:
105
Numéro:
1
Page initiale:
112
Page finale:
121
Editeur:
[Amsterdam]: Elsevier Science
Tous les titres:
"Evaluation of precision land leveling and double zero-till systems in the rice-wheat rotation: Water use, productivity, profitability and soil physical properties"@eng
Autre:
"Includes references"
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Information bibliographique

Langue:
English
Type:
Journal Article
Sur AGRIS depuis:
2013
Volume:
105
Numéro:
1
Page initiale:
112
Page finale:
121
Editeur:
[Amsterdam]: Elsevier Science
Tous les titres:
"Evaluation of precision land leveling and double zero-till systems in the rice-wheat rotation: Water use, productivity, profitability and soil physical properties"@eng
Autre:
"Includes references"