Data/hora: 12/06/2024 02:25:21

Provedor de dados: 	43	
País: 	Brazil	
Título: 	Estudos sôbre a Alimentação Mineral do Abacaxí (Ananas sativus) Sch	
Autores: 	Haag,H. P.; Arzolla,S.; Mello,F. A. F.; Brasil Sobr,M. O. C.; Oliveira,E. R.; Malavolta,E.	
Data: 	1963-01-01	
Ano: 	1963	
Resumo: 	Pineapple plants when grown in the greenhouse by the sand culture technique in order to study the effects of deficiencies of macronutrients in growth, yield, leaf and fruit composition, the main results were the following. As a result of the several treatments, yield decreased in the order: Complete Minus Mg Minus S Minus Ca Minus K; nitrogen and phosphorus deficiente plants did not bear fruit. Leaf analyses (see Table 5-1) showed that the ommission of given element from the nutrient solution always caused a decrease in its level in the green tissue. As seen in Table 5-2 the lack of macronutrients had certain effects on fruit composition: acidity increased in all cases excet in the minus Mg fruits; ash usually decreased reaching its lowest valued in fruits from the minus K plants; when compared to fruits picked in the "normal" plants, those lacking K showed a marked decrease both in brix and in total sugars as well; sulfur deficiency also brought a net reduction in the sugar content. Table 5-1. Levels of macronutrients found in pinapple leaves. Elements Treatment Percent of dry matter Nitrogen (N) Complete 1.29 Minus N 0.78 Phosphorus (P) Complete 0.12 Minus P .05 Potassium (K) Complete 2.28 Minus K 0.16 Calcium (Ca) Complete 1.19 Minus Ca 1.10 Magnesium (Mg) Complete 0.41 Minus Mg .29 Sulfur (S) Complete 1.00 Minus S .65 Table 5-2. Effects of macronutrients deficiency in yield and fruit characteristics. Treatment Ave. weight of Acidity As per Brix Total sugars fruits (gm) per cent cent per cent Complete 1.031 1.16 0.40 14.7 10.8 Minus N no fruit was produced Minus P no fruit was produced Minus K 246 1.44 0.26 11.9 8.3 Minus Ca 513 1.40 0.35 17.8 14.3 Minus Mg 957 0.97 0.38 15.4 13.0 Minus S 576 1.42 0.46 17.1 6.5	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Português	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761963000100004	
Editor: 	Universidade de São Paulo

Escola Superior de Agricultura	
Relação: 	10.1590/S0071-12761963000100004	
Formato: 	text/html	
Fonte: 	Anais da Escola Superior de Agricultura Luiz de Queiroz  v.20 1963	
Fonte: 	info:eu-repo/semantics/openAccess