Rooting of sweet potato seedlings submitted to supplemental calcium and phosphorus nutrition on substrate

Everton T M Ichikawa,Lydia Helena Da Silva De Oliveira Mota Mota,Adalton M Fernandes

doi:10.1590/1807-1929/agriambi.v23n11p860-868

Everton T M Ichikawa, Lydia Helena Da Silva De Oliveira Mota Mota + Show 1 more

Open Access

https://doi.org/10.1590/1807-1929/agriambi.v23n11p860-868

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Abstract

ABSTRACT The objective of this study was to evaluate the rooting and growth of sweet potato seedlings in trays in response to substrate supplementation with calcium (Ca) and phosphorus (P). Two greenhouse experiments were conducted in a randomized block design with a split plot scheme and eight repetitions. In the Ca experiment, the plots were the doses of 0, 100 and 200 mg kg-1 of Ca, and in the P experiment, by the doses of 0, 150 and 300 mg kg-1 of P. In both experiments, the subplots corresponded to the sampling time of seedlings (15, 30, 45, 60 and 75 days after planting). The Ca present in the substrate was sufficient to promote the proper rooting and growth of sweet potato seedlings in the trays. The Ca supply in excess (200 mg kg-1) adversely affected the growth of seedlings that remained in the tray for more than 60 days. Although the seedlings supplied with P showed higher root growth rate after 45 days, the initial P available in the substrate was sufficient to promote the adequate growth of the seedlings in the trays until 60 days.

Highlights

The production of sweet potato (Ipomoea batatas (L.) Lam.) seedlings from mini cuttings in trays in a controlled environment is a viable technique (Rós et al, 2011) that allows a greater production of seedlings when there is a shortage of stems (Rós-Golla et al, 2010), facilitates the control of pests and diseases, and provides greater uniformity in the field (Reghin et al, 2007; Rós-Golla et al, 2010).In the mini cutting system, the seedlings have better sanity (Montes, 2012) which results in greater yields in the field (Rós et al, 2012; Montes et al, 2015)
The Ca present in the substrate was sufficient to promote the proper rooting and growth of sweet potato seedlings in the trays
The seedlings supplied with P showed higher root growth rate after 45 days, the initial P available in the substrate was sufficient to promote the adequate growth of the seedlings in the trays until 60 days

Summary

Introduction

The production of sweet potato (Ipomoea batatas (L.) Lam.) seedlings from mini cuttings in trays in a controlled environment is a viable technique (Rós et al, 2011) that allows a greater production of seedlings when there is a shortage of stems (Rós-Golla et al, 2010), facilitates the control of pests and diseases, and provides greater uniformity in the field (Reghin et al, 2007; Rós-Golla et al, 2010).In the mini cutting system, the seedlings have better sanity (Montes, 2012) which results in greater yields in the field (Rós et al, 2012; Montes et al, 2015). As the nutritional status of seedlings plays an important role in the phases of induction and root formation (Cunha et al, 2009), crop nutritional management in this phase is very important. In this production system, it is necessary to provide supplemental fertilization of the substrate (Rós et al, 2011; 2013) because depending on the period of the seedlings’ permanence in the greenhouse, the substrate cannot supply the nutritional needs of the seedlings (Rós et al, 2011; 2013) and the supplemental fertilization can reduce the permanence time of seedlings in the greenhouse (Rós et al, 2013). The objective of this study was to evaluate the rooting and growth of sweet potato seedlings in trays in response to substrate supplementation with Ca and P

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