| Autor: |
Rogério Peres Soratto, Carlos Alexandre Costa Crusciol, Murilo de Campos, Amanda Prado Gilabel, Claudio Hideo Martins da Costa, Gustavo Spadotti Amaral Castro, Jayme Ferrari Neto |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Pesquisa Agropecuária Brasileira, Vol 56 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1678-3921 |
| DOI: |
10.1590/s1678-3921.pab2021.v56.02686 |
| Popis: |
Abstract The objective of this work was to evaluate the efficiency and the residual effects of both molten and ground alkaline potassium-silicate rocks (K1) and of ground phonolite rock (K2), as sources of potassium, compared with the traditional source (KCl), in grain crop successions. Two experiments – one with the succession soybean-wheat-corn and the other with the succession corn-millet-soybean – were conducted on a Typic Haplorthox in a randomized complete block design with four replicates. The treatments consisted of three sources (KCl, K1, and K2) and four rates of K (corresponding to 0, 0.5, 1.0, and 2.0 times the recommended rates for soybean and corn). The used sources did not affect leaf K concentration in soybean, but KCl and K2 similarly increased leaf K concentration in corn. Regardless of the source, K application increased the yield of all crops. The K1 and K2 sources present agronomic efficiencies equivalent to that of KCl. K1 and K2 show a more pronounced residual effect than KCl, especially on crops grown approximately one year after their application and under K rates above those recommended for the crops. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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