Nutritional status, production and fruit quality of west indian cherry fertigated with nitrogen and humic substance

Abstract

Information on humic substances (HS) associated with nitrogen fertilization in West Indian cherry is scarce in the literature. The use of soil conditioners, such as HS, can increase the efficiency in the absorption of nutrients, especially N. Therefore, the present study aimed to evaluate, in two production cycles, the fruit quality, yield and nutritional status of West Indian cherry as a function of fertigation with nitrogen (N) and HS in Petrolina-PE, Brazil. The experimental design was in split plots, with treatments distributed in 5 x 2 strips, referring to N doses (50, 75, 100, 125 and 150% of the recommended dose) and HS application (without and with), respectively, with 4 replicates and 3 plants per plot. The N source used was urea (45% N) and the HS source used was the commercial product KS100 (Omnia®), from leonardite, monthly applied at dose of 6 g plant-1. Production, yield, indices of chlorophyll a, chlorophyll b and total chlorophyll, and leaf contents of N, P, K, Na, Ca, Mg, Fe, Mn and Zn were determined. Fruits were evaluated for: pH, vitamin C, soluble solids (SS), titratable acidity (TA) and SS/TA ratio. Except for leaf N content, which increased linearly with the applied doses, the leaf contents of nutrients, production and yield of West Indian cherry showed a stochastic pattern as a function of the increase in N availability and HS application. West Indian cherry plants cultivated and fertilized according to the recommendation for the crop did not respond to the evaluated treatments. Application of humic substances and N doses did not alter the post-harvest quality of West Indian cherry fruits.

The Effect of Leonardite as Organic Material on Growth of Chickpea in the Kahramanmaraş Condition

“…Bu deneme sonucunda bulunan leonardit materyallerinin bitkilerin gelişim, verim ve bazı fizyolojik parametreleri üzerine bulunan olumlu etkisi önceki pek çok araştırıcılar tarafından da değişik parametrelerce desteklenmiştir (Uçar 2020;Dias et al 2020;Ertekin vd. 2020, Akimbekov et al 2020Aygün ve Mert 2020;Karayel vd.…”

“…Leonardit, yüksek miktarda hümik asit (HA) ve fulvik asit (FA) içeren organik bir karışımıdır (Sugier et al 2013;Rataprommanee and Shutsrirung 2014;Olivella et al 2011;Çankaya vd. 2017;Zengin 2013;Aygün ve Mert 2020;Filcheva et al 2017;Holatko et al 2020;Shahryari et al 2011;Wadas and Dziugieł 2020;Dias et al 2020;Karaman et al 2013). Son yıllarda leonardit'in toprak ve bitki yetiştirme açılarından potansiyel oluşturduğu ve bu konuda yapılan çalışmaların artmaya başladığı gözlenmektedir.…”

Produtividade de feijão comum cv. Pérola pelo emprego de ácidos húmicos no tratamento de sementes

“…Além disso, a parte aérea das plantas apresentam, também, um melhor desenvolvimento dos brotos e da produção (ROSA et al, 2009). Os efeitos que ocorrem durante o desenvolvimento dessas substâncias húmicas são influenciados por propriedades biológicas do solo e refletem no aumento da biossíntese de clorofilas, absorção de nutrientes e aumento do crescimento das raízes (DIAS et al, 2020). Contudo, os ácidos húmicos são fonte de N, P e S para as plantas e influenciam a mobilidade de pesticidas e contaminantes, auxiliando na remoção de soluções aquosas que retém diferentes nutrientes (SEGUEL et al, 2019).…”