Potassium sources and calcium and magnesium doses in carrot crop fertilization

Abstract

Fertilization has an important influence on carrot productivity and on the quality of the produced root, being responsible for most of the production cost of the crop. In this context, we evaluated the use of potassium (K) sources associated with calcium (Ca) and magnesium (Mg) doses in carrot cultivation. In a randomized block design in a triple factorial scheme (2x2x2), we evaluated two doses and sources of potassium [potassium chloride (KCl), 120 kg ha-1 of K2O; potassium sulfate (K2SO4) 120 kg ha-1 of K2O + 42,5 kg ha-1 of S]; Two doses of Mg [magnesium sulfate (MgSO4), zero kg ha-1 of Mg; 25 kg ha-1 of Mg + 34,2 kg ha-1 of S]; two doses of the commercial algae product Lithothamnium calcareum as an alternative source of Ca [zero kg ha-1 of seaweed; 200 kg ha-1 of seaweed (24 kg ha-1 of Ca)], all with six replications. Total productivity, 3A, commercial and percentage of discard carrot were evaluated. Regardless of the source of K used, the carrot production was median (above 40 t ha-1), with no application of Ca or Mg. The application of 25 kg ha-1 of Mg and zero Ca altered the Ca:Mg ratio in the soil and provided a significant increase in yield when KCl was used. The association of L. calcareum algae with KCl reduces total yield and increases carrot disposal.

Ascophyllum nodosum seaweed extract in Inga edulis seedlings under drought and the potential of phenotypic plasticity

“…The positive response of seedlings to the application of ANE is due to the enrichment of N, which favors vegetative growth (Santos et al 2020) and the contents of P, K, Ca, which act on the structure of plant tissue and biomass production (Costa et al 2020;Rodrigues Neto et al 2021). Thus, these elements acting together increased the development of LA, DQI, chlorophyll index, F v /F m and proline content in I.…”