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In a season hampered by wet weather and late sowing, never has it been more important to choose the right fertiliser in order to optimise your time efficiently. When time is off the essence the last thing growers need are compacted bags, sub standard material and the inability to spread beyond 24 metres.
At LAT Nitrogen, we pride ourselves on producing and offering to market hight quality granular nitrates all with a density above 0.9t/m3, an optimised granular size of 2-5mm and a resistance to caking. These attributes allow you, the grower, to have confidence to spread up to and beyond 36 metres with an excellent CV , even in less clement conditions.
Precise application allows the crop to better take up the nutrients applied and therefore improve yields and quality of crops. Our strategic partners throughout the UK have chosen to promote and offer our two most popular brands of MYPREMIAN 33.5% Granular AN and MYNITRAS 27N 10S03 not only based on their competitive pricing, but for the high levels of quality we offer as a producer.
Irregular spreading is made visible by alternate light and dark strips in the field, which lead to yield losses. Furthermore, the compound fertilizer facilitates a denser distribution (more granules per plant) in the field compared to fertilization with straights or bulk blends.
Uniform distribution depends on even fertilizer output from the disc and overlapping between two passes (out and back) of the broadcasted fertilizer granules.
To test the regularity of fertilizer spreading, the actual dose of fertilizer spread over the projecting distance is measured and the curve of the spreading profile is plotted.
Spreading regularity is expressed in coefficient of variation (CV), which quantifies the average deviation of doses applied in relation to the mean dose, and is stated as a percentage. CV as defined in European Standard 13739 is the ratio between the standard deviation and the mean total distribution.
The lower the CV, the better the distribution. The quality of fertilizer distribution is expressed as follows:
Imprecise spreading can have serious consequences. It is often visible in strips or waves, showing 30% over or under-dosing. Uneven and imprecise distribution of fertilizer leads to nutrition deficiencies of the plants, and thus a reduction in yield and protein content. Fertilizing more than the economic optimum causes loss in revenue and increases the risk of unproductive nitrogen loss.
It is a false assumption that uneven spreading would even out on a field. Higher yields due to more fertilization do not balance the lower yields due to less fertilization because of the flattening dose-response curve. This is true at any yield level and without crop damages.
Illustration of the gains and losses due to more and less fertilization than specified (200 kg N/ha). The dose-response-curve flattens; therefore, yield losses (red) are always larger than the gains (green).
