4R Nutrient Stewardship
An innovative approach to best management practices (BMPs) for fertilizer is the Right Source, Right Rate, Right Time, Right Place concept.
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.
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.
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.
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.
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.