Amending soil by enhancing fertilizer with Zeolite is a tested method to increase crop yields, promote additional foliage, and stronger root zones.
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1   Link   Controlled Release Fertilizers
The U.S. Geological Survey (USGS) has experimented with zeolites to help control the release of fertilizer nutrients in soil. The use of soluble fertilizers can lead to water pollution and to wasted nutrients. Nitrogen, for example, can leach into ground and surface waters, especially in sandy soils, and phosphate may become fixed and unavailable to plants, especially in tropical soils. Zeolites are porous minerals with high cation-exchange capacity that can help control the release of plant nutrients in agricultural systems. Zeolites can free soluble plant nutrients already in soil, and may improve soil fertility and water retention. Because zeolites are common, these unique minerals could be useful on a large-scale in agriculture.
2   Link   Ammonia volatilization and ammonium accumulation from urea mixed with zeolite and triple superphosphate
Ammonia volatilization from surface-applied urea fertilizer reduces N fertilizer use efficiency by crops. Beneficial formation
of NH4 over NH3 leading to reduction of NH3 loss may be possible through addition of zeolite and acidic materials. The objective of this laboratory study was to evaluate the effect of four different urea-triple superphosphate (TSP)-zeolite mixtures on NH3 volatilization and NH4 and NO3 contents in soil, compared with surface-applied urea without additives.The soil was a sandy clay loam Typic Kandiudults (Bungor Series). The mixtures significantly reduced NH3 loss by 34 to 49% compared with urea (straight urea, 46% N) and larger reductions were obtained with higher rates of zeolite (0.75 and 1 g kg1 of soil). All the mixtures of acidic P fertilizer and zeolite with urea significantly increased soil NH4 content but not NO3 content. The mixtures with acidic P fertilizer and zeolite also significantly increased soil-exchangeable Ca, K and Mg,and benefited the formation of NH4 over NH3 compared with urea without additives. The increase in soil-exchangeable
cations, and temporary reduction of soil pH, might have impeded urea hydrolysis in the microsite immediately around the
fertilizer. It could be possible to improve the efficiency of urea surface-applied to high value crops by addition of TSP and
zeolite.
3   Link   On the Study of Positive Prolonged Effect of Natural Zeolites on Grape Yield
It has been shown that mean grape yield per vine plant increases compared with the control 1.8-2.8-fold, grape juice sugariness - within 5-27%, while acidity decreases from pH=3.75 to 4.52 according to the type of natural zeolite and corresponding organo-zeolite fertilizer used under vine as well as the prolongation period.
4   Link   Nanoporous zeolites in farming: current status and issues ahead
In many parts of the world food security is being affected due to declining quality and/or quantity of the soil resource base and climate change. Climate change summits are being held worldwide to prevent crop
failures. Notwithstanding this fact, one of the root biophysical causes of falling per capita food grain production is reported to be soil resource degradation.In order to reverse this trend of soil base degradation,
it is necessary to either expand the land base under cultivation or to intensify crop production per unit of land. Soils are either inherently low fertile or made less fertile due to the removal of nutrients without adequate replenishment by intensive farming. It is in this context that the farming with nanoporous zeolites assume significance.

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