Cultivares De Mandioca Submetidas a Adubacao Fosfatada Na Amazonia Sul Ocidental

Abstract

RESUMOA mandioca está entre as cinco principais fontes de carboidratos de toda população mundial, é cultivada para diversas finalidades e pode ser utilizada para alimentação humana ou animal em diferentes formas. O cultivo de mandioca é uma atividade desenvolvida caracteristicamente por pequenos produtores, que necessitam de alta produtividade em uma pequena área. Oriunda da região amazônica, seu cultivo é abundante em Rondônia, porém ainda devem ser empregadas praticas edáficas para o seu melhor rendimento. O fósforo é o nutriente mais limitante na produção vegetal, e apresenta teores baixos na maioria dos solos brasileiros. Este trabalho teve como objetivo avaliar a produtividade, quantidade e comprimento de raízes em quatro cultivares, sendo elas, Cacau, Kiriris, Gema de ovo e Dourada, submetidas a diferentes dosagens de P 2 O 5 , 0, 40, 80, 120 e 160 kg ha -1

Agronomic performance of cassava fertilized with phosphorus doses

“…The results obtained in each crop show what other studies have already found: Cuvaca et al ( 2017) observed an increase in root productivity with the addition of phosphate fertilizer; Silva et al (2014), Tironi et al (2015), Omondia et al (2019) and Kang et al (2020) observed variation in productivity between cassava cultivars and variation for cultivars in different crops due to meteorological differences and the chemical attributes of the soil in the study sites; and Enck et al (2017) found no difference in productivity between cassava cultivars fertilized with increasing doses of P.…”

“…For the commercial root number, there is a tendency for variations to occur due to genetic factors inherent to each cultivar. There would not be an effect of the application of increasing P doses, a fact also observed by Enck et al (2017), who found no difference in the number of roots between cassava cultivars fertilized with increasing doses of P. Similar results for the commercial root number have also been reported by Tironi et al (2015), who observed a difference in the commercial root number of five cassava cultivars, as well as a difference between the two agricultural crops evaluated.…”

“…Alves et al (2012), Alves Filho et al (2015, Cuvaca et al (2017) and Biratu et al (2018) observed the effect of fertilization in increasing productivity for cassava. However, studies in which the isolated effect of phosphorus (P) on root production are still scarce (Sieverding and Howeler 1985;Pellet and El-Sharkawy 1993a;Pellet and El-Sharkawy 1993b;Enck et al 2017;Lima et al 2018;Omondia et al 2019), which demonstrates that it is necessary to intensify this line of research.…”

“…Cassava reaches increases in root productivity with the application of increasing doses of P (up to 160 kg ha -1 of P2O5) in soils with low nutrient availability: 1.44 mg dm -3 (Lima et al 2018), 2 mg dm -3 (Burgos and Cenoóz 2012;Enck et al 2017), 2-15 mg dm -3 of P (Silva et al 2013). Pellet and El-sharkawy (1993b) observed different cassava cultivars responded differently in terms of their production of roots and aerial parts, with cultivars showing an increase in the production of roots and aerial part, while one cultivar did not obtain an increase in yield for the roots, only presenting an effect for the aerial part.…”