In our research, two measures to stimulate growth in green asparagus production were studied in order to provide information on the usefulness of growth promotion measures and their impact on crop yield. Two treatments were included in the experiment: covering of soil with polypropylene cover and the placement of low tunnels covered with polyethylene above the rows of asparagus and the uncovered rows. The soil was directly covered with polypropylene from the beginning of March until the first shoots emerged. Then, the cover was removed and the low tunnels, 0.5 m high and 5 m long covered with polyethylene were installed (from the beginning of March 2017). A variety of 'Dariana' asparagus was included in the study. The experiment was designed in 4 replicates and 10 plants in one replication. Measurements on plants were performed between April 8 and 18, 2017. During this period, the growth rate of shoots was measured and at harvest, the length, diameter, and mass of individual shoot were measured. Results showed that low tunnels have an effect of increasing the soil temperature by an average of 6.1 °C. Bed covering with low tunnel affected the microclimate creating higher relative air humidity (on average for 3.4%) and higher air temperature (on average for 11.9 °C) and also affects faster shoot growth which resulted in higher yield (on the covered soils 244.5 g/m² and on the uncovered 37.9 g/m²). On the covered parts of the plantation, the harvest of the shoots starts 6 days earlier than on the uncovered parts and as a consequence, the harvesting season can be prolonged. The more favorable microclimate under the low tunnels resulted in a larger number of harvested shoots that were larger, thicker, and heavier in comparison to the uncovered plots.
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