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Abstract: Although it has always been stated that poultry manure contains sufficient minerals and microelements to guarantee a maximum yield, experiments with the addition of the Micromax minerals' and microelements' additive indicate an average yield increase between 4.7% (60g Micromax/m2) and 6.6% (120g Micromax/m2). The results concerning the extra-yield are inegular and vary between -3.6% and +11.5% (60g Micromax/m2) and between +0.8% and +21.3% (120g Micromax/m2). From a conelation analysis comparing the initial manure composition to the final extra-yield, it cannot be deduced for the moment which added element or which modification of relation of elements caused the yield increase. At this moment, there are too few data available to obtain an answer through a correlation analysis. In any case, it is sure that the supply of minerals and microelements through manure can be insufficient and that further research is necessary.
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