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Publications - SEAP in Better Crops
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Southeast Asia Program
Articles Published in Better Crops
Better Crops with Plant Food on-line archive (1997-present).
Better Crops International on-line archive (1996-2003).
2008
Balancing Fertilizer Use and Profit in Asia’s Irrigated Rice Systems By R.J. Buresh and C. Witt
About 90% of Asia’s population, particularly the most impoverished, depend on rice as a source of their calories. The production of sufficient rice in Asia at an affordable price for the poor relies on the effective use of fertilizers, especially in the irrigated lowlands that produce 75% of Asia’s rice.
2007
Spatially Variable Soil Fertility in Intensive Cropping Areas of North Vietnam and Its Implications for Fertilizer Needs By C. Witt, B.T. Yen, V.M. Quyet, T.M. Thu, J.M. Pasuquin, R.J. Buresh, and A. Dobermann
A soil survey on more than 100,000 ha of degraded soil with intensive rice and maize cultivation in North Vietnam revealed potential multiple nutrient stresses at large scale and offered improvements of site-specific nutrient management strategies for delivery.
2006
Potassium Budgets in Rice Cropping Systems with Annual Flooding in the Mekong River Delta By Nguyen My Hoa, B.H. Janssen, O. Oenema, and A. Dobermann
Potassium (K) balances provide crucial information for assessment of fertilizer needs and sustainability of rice cropping systems.
Towards a Site-Specific Nutrient Management Approach for Maize in Asia By C. Witt, J.M. Pasuquin, and A. Dobermann
A new regional initiative has the goal of improving the productivity and profitability of maize in key agro-ecological zones of Southeast Asia through site-specific, integrated nutrient and crop management.
2005
A Nutrient Decision Support System Software for Irrigated Rice By C. Witt, T.H. Fairhurst, J.E. Sheehy, A. Dobermann, and A. Gfroerer-Kerstan
The Nutrient Decision Support System (NuDSS) for irrigated rice is part of an initiative by the Irrigated Rice Research Consortium to provide decision support on site-specific nutrient management (SSNM)in the irrigated lowlands. The software, consistent with earlier publications on SSNM, includes a handbook and practical guide.
Key Principles of Crop and Nutrient Management in Oil Palm By C. Witt, T.H. Fairhurst, and W. Griffiths
There are substantial opportunities for the oil palm industry to increase productivity on planted land, considering the scarcity of suitable land for further expansion in Southeast Asia. We propose a framework for an ecological intensification of oil palm production, summarizing key crop and nutrient management principles.
New Leaf Color Chart for Effective Nitrogen Management in Rice By C. Witt, J.M.C.A. Pasuquin, R. Mutters, and R.J. Buresh
Leaf color charts (LCC) offer substantial opportunities for farmers to estimate plant nitrogen (N) demand in real time for efficient fertilizer use and high rice yields. We developed a new, standardized LCC for rice in Asia based on the actual colors of rice leaves. The new chart and updated guidelines for its use are promoted in many Asian countries through the Irrigated Rice Research Consortium (IRRC).
2004
Long-Term Phosphorus and Potassium Strategies in Irrigated Rice By C. Witt, A. Dobermann, R. Buresh, S. Abdulrachman, H.C. Gines, R. Nagarajan, S. Ramanathan, P.S. Tan, and G.H. Wang
The site-specific nutrient management (SSNM) approach for rice provides sufficiently robust estimates of long-term fertilizer phosphorus (P) and potassium (K) requirements to avoid nutrient depletion. Additional information from long-term experiments may be required to fine tune fertilizer P and K recommendations developed on-farm.
Phosphorus Fertilization Strategies for Groundnut Grown on Upland Acid Soils in Nghe An Province By Nguyen Cong Vinh
Sustained cash crop production in the acid uplands of North Vietnam can be seriously hampered by the strong phosphate (P) adsorption capabilities of the region’s soils. Insight into the nutrient demand of groundnut (peanut) is gained through this series of laboratory and field studies.
2003
Effect of Phosphorus Fertilizer on Groundnut Yield in Poor Alluvial and Sandy Soils of Thua Thien Hue By Tran Thi Thu Ha
Although groundnut (peanut) yield in Thua Thien Hue Province is improving, current productivity levels are still low. Phosphorus (P) fertilization of groundnut is considered as one limiting yield factor common to several soil types in this province. This research helps to identify the appropriate application rates for sustained, high-yielding groundnut in poor alluvial and sandy soils.
Implementation of Best Management Practices in an Oil Palm Rehabilitation Project By William Griffiths and T.H. Fairhurst
Implementation of best management practices (BMPs), including soil phosphorus (P) recapitalization, resulted in a rapid increase in palm nutrient status and yield in the first year following implementation in South Sumatra. On the highly weathered and low soil P status soils of the region, high yields can only be expected where soil P deficiency has first been corrected by a large one-time application of reactive rock phosphate (RRP).
2002
SSNM Part 4: Improving Nutrient Management Strategies for Delivery in Irrigated Rice in Asia By C. Witt, R.J. Buresh, V. Balasubramanian, D. Dawe, and A. Dobermann
An important task is to package the scientific principles of sitespecific nutrient management (SSNM) into guidelines for extension workers and farmers.
SSNM Part 3: Variation in the Performance of Site-Specific Nutrient Management among Different Environments with Irrigated Rice in Asia By S. Abdulrachman, H.C. Gines, R. Nagarajan, S. Satawathananont, T.T. Son, P.S. Tan, and G.H. Wang
Geographical differences in the performance of a new site-specific nutrient management (SSNM) approach were evaluated for major rice growing environments in six Asian countries. Four major cropping scenarios and corresponding nutrient management strategies are discussed using the experimental sites as examples.
SSNM Part 2: Performance of Site-Specific Nutrient Management in Intensive Rice Cropping Systems of Asia By A. Dobermann, C. Witt, and D. Dawe
A site-specific approach to nutrient management was evaluated in 179 on-farm experiments with irrigated rice in China, India, Indonesia, Thailand, the Philippines, and Vietnam. The agronomic and economic performance of the new approach was compared with current farmer fertilizer practices for four crops.
SSNM Part 1: A Site-Specific Nutrient Management Approach for Irrigated, Lowland Rice in Asia By C. Witt and A. Dobermann
Site-specific nutrient management (SSNM) strategies that include site and season-specific knowledge of crop nutrient requirements and indigenous nutrient supplies are required to increase productivity, yields, and nutrient use efficiency in irrigated rice systems of South and Southeast Asia. The SSNM concept described here was developed and tested in more than 200 farmer fields in six Asian countries.
1999
Better Crops International Special Issue on Oil Palm
In this special edition of Better Crops International, we offer readers useful insights on oil palm agronomy provided by scientists working in some of the oil palm growing areas worldwide.
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