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USING THE HARVESTLAB TECHNOLOGY FOR A VARIABLE APPLICATION OF DIGESTATE FROM THE BIOGAS PLANT - FIRST OPERATIONAL EXPERIENCES IN TERMS OF ITS INFLUENCE ON THE YIELD OF ZEA MAYS L
Abstract
The submitted paper focuses the issue of using a new technology of Near Infrared Reflectance (NIR) sensors in practice for dosing organic fertilizers based on their composition. The HarvestLab 3000 system was tested in a selected enterprise in terms of its usability in practice. In 2021, an experimental plot was selected in a conventional company situated in the southern part of Czech Republic. The HarvestLab 3000 system with the NIR technology was used for the variable (VR) dosage of digestate as a basic fertilization of Zea mays L. based on the content of potassium (K). Zones with different yield potentials (YP) were demarcated on the plot and mean dose of digestate was determined according to the initial K content in this fertilizer. Zones with the mean YP were applied 32.5 kg K/ha. The dose of K was increasing with the growing YP by up to +15 % and decreasing with the falling YP by up to -15 %. The amount of applied digestate was changing in dependence on the content of K therein, which was quantified by using the HarvestLab 3000 system. Further, a control belt was demarcated on the plot, with a flat rate application (PAU) of 13,800 kg/ha of digestate. The Zea mays L. was harvested using the cutter model 9700 equipped with the yield meter and HarvestLab 3000 system for quality measurements (ADF, NDF, sugar, starch, crude protein) of harvested biomass. The measured values demonstrated (P less than 0.05) that the VR application had no negative impact on the yield and quality of harvested Zea mays L. biomass. The yield in dry matter was 14,710 kg/ha in Variant VR and 13,470 kg/ha in Variant PAU. Although the difference is not significant (P>0.05), a mean digestate application in Variant VR reached 12,900 kg/ha while it was 13,800 kg/ha in Variant PAU. Therefore, the HarvestLab300 may lead to a greater effectiveness of the utilization of nutrients contained in organic fertilizers.
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