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4R Nutrient Stewardship

An innovative approach to best management practices (BMPs) for fertilizer is the Right Source, Right Rate, Right Time, Right Place concept.

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07 May 2013Fertilizers: Organic vs. Inorganic

Do organic amendments (OA) improve yield trends and profitability in intensive rice systems? The following conclusions emerged after analyzing yield trends of 25 long-term experiments (LTE) with rice-rice (R-R) and rice-wheat (R-W) systems across a wide geographical range in Asia.

07 May 2013Fertilizer K placement guidelines

The major objective of all approaches to fertilizer application regardless whether applied as single nutrient or as a compound fertilizer is to ensure the most efficient uptake of fertilizer K by plant roots.

07 May 2013Sources of K fertilizer

K fertilizers are mined and refined from underground ore deposits, salt lakes and brines. North America, the former Soviet Union, and Europe account for almost 90% of world output. Known potash reserves are estimated to be equivalent to 9 billion t K2O.

07 May 2013Fertilizer Compatibility and Storage

Improper mixing and storage of fertilizers can result in large nutrient losses. Some important aspects to consider in fertilizer mixing and storage include the following: Urea should not be mixed with ammonium calcium nitrate (CAN), KCl, SSP or TSP.

07 May 2013Assessing rock phosphate quality

A large number of rock phosphates is available on the market in Southeast Asia. How does the agronomist select a suitable source? Here are some basic points to keep in mind: Whilst we all use P2O5 content as an index of quality it doesn't mean much in terms of the potential effect of the rock phosphate on crops.