Application of different nitrogen doses in fertirrigated cacao seedlings

Matheus Hofmann Trevisan,Sandra Andrea Santos Da Silva,Rafael Oliveira Da Silva,Maysa Lorrane Medeiros De Araújo,Emanuelle Valeska Bilhar Araújo,Vitor Lunelli Araújo,Cláudia Barbosa Cordeiro,Vivian Dielly Da Silva Farias,Miguel Alves Júnior

doi:10.33448/rsd-v10i11.19396

Matheus Hofmann Trevisan, Sandra Andrea Santos Da Silva + Show 7 more

Open Access

https://doi.org/10.33448/rsd-v10i11.19396

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Abstract

The Medicilândia municipality is the main dried cocoa beans producer in Pará state, however, researches are being carried out in relation to the seedlings production. The study objective was to study the cacao seminal seedlings growth under a drip irrigation system, receiving different nitrogen doses with fixed doses of phosphorus (4,5 g) and potassium (3 g) through fertirrigation. The experiment was realized under greenhouse conditions with four treatments and five repetitions in a design of randomized blocks, being each composed by seven plants. Thus, T1 = check, without fertilization; T2 = 2 g of N + P and K; T3 = 7 g of N + P and K; T4 = 12 g of N + P and K. The treatments were scientific from the 31st to the 156th day after sowing, where the values of height, collar diameter and leaves number were obtained fortnightly. On the 156th day, the plants were harvested and obtained the root length, fresh matter and aerial part dry matter and root and the nutritional contents from the leaf and root plant tissue. The plants obtain results with the highest values of height, collar diameter and leaves number in the T2 treatment.

Highlights

The Medicilândia municipality, located in the Transamazônica region, Pará state, is known by its high potential in the dried cocoa beans production for chocolate and cocoa butter manufacture
Regarding to cocoa mineral nutrition, it is known that the requirement for nitrogen (N) and potassium (K) is high in the fruiting phase and contributes to the production increase, there are few studies in the seedlings production phase (Sodré et al 2012; Almeida et al 2014)
For the cacao effective fertilization, the water correct management so that the nutrients are solubilized, since most part of these nutrients are absorbed through mass flow

Summary

Introduction

The Medicilândia municipality, located in the Transamazônica region, Pará state, is known by its high potential in the dried cocoa beans production for chocolate and cocoa butter manufacture. Cocoa is typical of tropical climate and, very demanding in water, the crop demands high rainfall with about 1.200 mm per year, distributed in 100 mm Monthly (Souza et al, 2009). Regarding to cocoa mineral nutrition, it is known that the requirement for nitrogen (N) and potassium (K) is high in the fruiting phase and contributes to the production increase, there are few studies in the seedlings production phase (Sodré et al 2012; Almeida et al 2014). For the cacao effective fertilization, the water correct management so that the nutrients are solubilized, since most part of these nutrients are absorbed through mass flow. It is common leaching losses, causing damage to the environment and production costs increase (Silva et al, 2017)

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