Boron doses applied to soil during coffee development

Abstract

The range between boron deficiency and toxicity in the coffee crop is narrow and the crop toxicity tolerance depends on the soil type, initial soil content and plant age. The objective of this study was to evaluate different levels of boron in the coffee crop during development and grown in a red clayey Oxisol. Treatments consisted of boron applications (zero; 2.48; 4.96; 9.92; 19.8 and 39.68 kg ha-1) in the boric acid form and applied to soil surface in the area of the tree crown projection. The six treatments were outlined in a randomized block design with four replications and ten plants per plot. The cultivar used was Catuaí IAC 144 with sixteen months old, grown in an Oxisol in Campinas, SP, Brazil. Foliar boron content was analyzed as a function of time by regression analysis. The levels in fruit and yield were analyzed by regression according to boron doses. It can be concluded that higher boron doses in the plant can be observed when fruits are at the first development stage. High doses can reduce yield productivity, being each kilogram of applied boron responsible for a reduction of 0.33 coffee bags. ha-1.

Physiological quality and grain production of Phaseolus vulgaris (cv. BRS Pérola) using boron (B) application under irrigatation system

“…The grain yield reduction promoted by boric acid suggested a toxic effect of this source, mainly when high doses are used (Prado, 2008), which can be attributed to the high solubility of this source (17%). The high B levels in plants are usually associated with low dry mass production (Santinato et al, 2016). Using a less soluble source, reductions in grain yield were observed only when applied doses were very high, suggesting that phytotoxic effects occur only when B is in excess (Papadakis et al, 2004;Simón et al, 2013).…”

“…Moreover, boron deficiency directly affects some physiological processes related to grain production in common beans, like the pollen grain germination, the pollen tube formation, the seeds genesis, the protein formation and the amino acids syntheses (Prado, 2008;Marschner, 2012). Therefore, the B imbalance in plants can cause many physiological disturbs in plants (Papadakis et al, 2004;Simón et al, 2013), which may affect crops productivity (Santinato et al, 2016). Recent researches developed by Flores et al (2017) using the BRS Estilo beans cultivar, also observed higher SC rates when boric acid was used compared with borax.…”

Análisis multivariado de la fertilidad de los suelos en sistemas de café orgánico en Puente Abadía, Villavicencio

“…Una deficiencia de B se nota en las hojas adultas presentando suberización con presencia de corcho en la vena central y las secundarias (Rosolem & Leite, 2007). El B al igual que el Ca, no se transloca a los puntos de crecimiento, es necesario un suministro constante de B para el desarrollo normal de las plantas (Santinato et al 2016). En la tabla 2, el Mg correlacionó positivamente con el Al 3+ intercambiable, el Na correlacionó negativamente con P y positivamente con Zn; el P mostró una correlación negativa con Zn y Cu, a su vez, éste correlacionó positivamente con el S. Según Rodríguez-Garay et al (2016), en sistemas de café, se presentó una correlación positiva con Cu, Fe y Zn, además de ser el Zn el elemento que más se beneficia con incrementos en el pH, como se observó en las correlaciones del Fe y de P, respecto al Zn.…”

Boron Nutrition in Coffee Improves Drought Stress Resistance and, Together with Calcium, Improves Long-Term Productivity and Seed Composition

“…The optimum foliar B concentration for coffee in the third and fourth pair of leaves is considered normal between 60 and 80 mg.kg −1 [21,59]. In this research, in well-watered conditions, the highest biomass accumulation was achieved with a B content in the young leaves of 63.72 mg.kg −1 and in mature leaves of 265.07 mg.kg −1 .…”