ORGANIC COMPOST AND MYCORRHIZAL INOCULATION ON PHYSIC NUT SEEDLINGS COMPOSTO ORGÂNICO E INOCULAÇÃO MICORRÍZICA NA PRODUÇÃO DE MUDAS DE PINHÃO MANSO

Abstract

<p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span><span style="font-size: x-small;"><span style="font-size: small;">Physic nut species has shown great potential for biofuel production. This study aimed to evaluate the effect of inoculation with the arbuscular mycorrhizal fungus </span><span style="font-size: small;"><em>Glomus clarum</em></span><span style="font-size: small;"> and the application of organic compost on the growth and phosphorus (P) and nitrogen (N) </span><span style="font-size: small;">absorption,</span><span style="font-size: small;"> in physic nut seedlings. A randomized experimental blocks design, in a 5x2 factorial scheme, was used, with the evaluation of organic compost levels (0 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, 15 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, 30 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, 60 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, and 120 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">) and presence or absence of </span><span style="font-size: small;"><em>Glomus clarum</em></span><span style="font-size: small;">, with four replications. Physic nut seedlings inoculated with </span><span style="font-size: small;"><em>Glomus clarum</em></span><span style="font-size: small;"> presented, at levels of 15 t ha</span>^{<span style="font-size: small;">-1 </span>}<span style="font-size: small;">of organic compost, the lowest height (20%), 120 days after sowing. However, the basal diameter increased, at levels of 30 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;"> (21%) and 120 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;"> (33%) of organic compost, 60 days after sowing. Only in the treatment with </span><span style="font-size: small;"><em>Glomus clarum</em></span><span style="font-size: small;">, physic nut seedlings showed increasing linear regression adjustment in the dry matter of stem (R</span>^{<span style="font-size: small;">2</span>}<span style="font-size: small;"> = 0.99), aerial part (R</span>^{<span style="font-size: small;">2</span>}<span style="font-size: small;"> = 0.98), roots (R</span>^{<span style="font-size: small;">2</span>}<span style="font-size: small;"> = 0.95), and whole plant (R</span>^{<span style="font-size: small;">2</span>}<span style="font-size: small;"> = 0.97), depending on the organic compost levels. Physic nut seedlings inoculated with </span><span style="font-size: small;"><em>Glomus clarum</em></span><span style="font-size: small;"> showed increases in P content of the aerial part of 93%, 37%, 57%, and 51%, for levels of 15 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, 30 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, 60 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;">, and 120 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;"> of organic compost, respectively. For the N content, such increases were 50% and 45%, at levels of 0 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;"> and 60 t ha</span>^{<span style="font-size: small;">-1</span>}<span style="font-size: small;"> of organic compost, respectively.</span></span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span><span style="font-size: small;">KEY-WORDS: <em>Jatropha curcas</em> L.; biofuel; <em>Glomus clarum</em>; seedlings quality.</span></span></span></p><p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span><span style="font-size: small;">A esp&eacute;cie pinh&atilde;o manso t&ecirc;m se mostrado bastante promissora para a produ&ccedil;&atilde;o de biodiesel. O presente trabalho objetivou avaliar o efeito da inocula&ccedil;&atilde;o do fungo micorr&iacute;zico arbuscular <em>Glomus clarum</em> e da aplica&ccedil;&atilde;o de composto org&acirc;nico sobre o crescimento e absor&ccedil;&atilde;o de f&oacute;sforo (P) e nitrog&ecirc;nio (N), em mudas de pinh&atilde;o manso. Utilizou-se o delineamento experimental em blocos ao acaso, em esquema fatorial 5x2, sendo avaliados os fatores doses de composto org&acirc;nico (0 t ha^-1, 15 t ha^-1, 30 t ha^-1, 60 t ha^-1 e 120 t ha^-1) e presen&ccedil;a ou aus&ecirc;ncia do inoculante <em>Glomus clarum</em>, com quatro repeti&ccedil;&otilde;es. As mudas de pinh&atilde;o manso inoculadas com <em>Glomus clarum </em>apresentaram, na dose de 15 t ha^-1 de composto org&acirc;nico, menor altura (20%), aos 120 dias ap&oacute;s a semeadura. No entanto, o di&acirc;metro, &agrave; altura do colo, foi maior, nas doses de 30 t ha^-1 (21%) e 120 t ha^-1 (33%) de composto org&acirc;nico, aos 60 dias ap&oacute;s a semeadura. Apenas no tratamento com <em>Glomus Clarum</em>, mudas de pinh&atilde;o manso apresentaram ajuste de regress&atilde;o linear crescente, na mat&eacute;ria seca de caule (R²= 0,99), parte a&eacute;rea (R²= 0,98), ra&iacute;zes (R²= 0,95) e planta inteira (R²= 0,97), em fun&ccedil;&atilde;o das doses de composto org&acirc;nico. Mudas de pinh&atilde;o manso inoculadas com <em>Glomus clarum</em> apresentaram incrementos nos teores de P da parte a&eacute;rea de 93%, 37%, 57% e 51%, para as doses de 15 t ha^-1, 30 t ha^-1, 60 t ha^-1 e 120 t ha^-1 de composto org&acirc;nico, respectivamente. Para os teores de N, tal incremento foi de 50% e 45%, nas doses de 0 t ha^-1e 60 t ha^-1 de composto org&acirc;nico, respectivamente.</span></span></span></p> <p style="margin-bottom: 0cm; font-style: normal; font-weight: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="JUSTIFY"><span style="color: #000000;"><span><span style="font-size: small;">PALAVRAS-CHAVE: <em>Jatropha curcas </em>L.; biocombust&iacute;vel; <em>Glomus clarum</em>; qualidade de mudas.</span></span></span></p>

Keywords

• Jatropha curcas L.
• biocombustível
• Glomus clarum
• qualidade de mudas