Abstract
The study on the effect of earthworm manure and HI-BORON 7-14 foliar fertilizer on chemical properties of soil and yield of rice OM18 was conducted in the Winter-Spring and Summer-Autumn seasons 2019-2020. The field experiments included four treatments and four replications in Long Xuyen City, An Giang province. Each treatment was the area of 48 m2 (8 m x 6 m). Treatments of season 1 (Winter-Spring) included: The control treatment (NT1) only applied NPK (85 kg N - 45 kg P2O5 - 45 kg K2O); (NT2): Incorporation of NPK and Hi-Boron 7-14 foliar fertilizer; (NT3): Incorporation of NPK and earthworm manure Atiga (300 kg ha-1); (NT4): Incorporation of NPK, earthworm manure Atiga (300kg ha-1) and Hi-Boron 7-14 foliar fertilizer. Treatments of season 2 (Summer-Autumn) were carried on the former experiment 1. However, treatments did not apply earthworm manure Atiga and spray Hi-Boron 7-14 foliar fertilizer (only applied 85 kg N-45 kgP2O5-45kg K2O). The results showed that the application of NPK, earthworm manure Atiga (300 kg ha-1) and Hi-Boron 7-14 foliar fertilizer improved organic matter, total nitrogen, available phosphorous and available potassium in soil. On the other hand, the combined fertilization increased the yield of rice OM 18 (11,3%) compared to the control treatment (without applying earthworm manure Atiga and spray Hi-Boron 7-14 foliar fertilizer). In Winter-Spring, the yield of rice OM18 in applying earthworm manure Atiga and spray Hi-Boron 7-14 foliar fertilizer had higher than 14,9% compared with applying only NPK in the Summer-Autumn season in the same treatment. The soil properties were not much improved due to no additional application of earthworm manure Atiga and spraying foliar fertilizer.
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