A complex assessment of mineral fertilizers with humic substances in an agroecosystem of acid soil

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Abstract

This study aimed to evaluate the impact of total humic extract (THE) and complex mineral fertilizer N5 P15 K25 enriched with humic substances (HS) 0.5% on moraine loam soil properties and crop productivity. The field experiment was performed in Western Lithuania (55°43ʹ N, 21°27ʹ E) at Vėžaičiai Branch of the Lithuanian Research Centre for Agriculture and Forestry in 2015–2017. Experimental object: THE 16.5%, which contains 13.2% humic acids, 3.3% fulvic acids and 5.5% potassium oxide (K2 O), and complex mineral fertilizer N5 P15 K25 enriched with HS 0.5% consisting of humic and fulvic acids. The soil of the experimental site was moraine loam Bathygleyic Dystric Glossic Retisol. The experiment included the following treatments: 1) unfertilized (control), 2) NPK + THE 20 L ha-1, 3) NPK traditional, 4) NPK 400 kg ha-1 with HS 0.5% and 5) NPK 200 kg ha-1 with HS 0.5%. The experimental data indicated that the application of NPK + THE 20 L ha-1 or complex mineral fertilizers NPK 400 and 200 kg ha-1 with HS 0.5% additives tend to mitigate moraine loam soil acidification and to contribute more to the formation of water-stable aggregates in the topsoil compared with NPK traditional. The both rates of mineral NPK fertilizers enriched with HS 0.5% significantly (by 1.8–2.1 times) increased the content of water-soluble phosphates in the topsoil compared with unfertilized soil. The highest amount of water-extractable organic carbon and the greatest soil biological activity were determined in the soil after incorporation of 400 and 200 kg ha-1 of mineral fertilizers enriched with HS 0.5%. In terms of crop yield, soil enrichment by mineral fertilizers (400 and 200 kg ha-1) with HS 0.5% additives and by the NPK + THE 20 L ha-1 was superior to NPK traditional fertilization.

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Karčauskienė, D., Repšienė, R., Ambrazaitienė, D., Mockevičienė, I., Šiaudinis, G., & Skuodienė, R. (2019). A complex assessment of mineral fertilizers with humic substances in an agroecosystem of acid soil. Zemdirbyste, 106(4), 307–314. https://doi.org/10.13080/z-a.2019.106.039

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