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Cultivo de Plantas em Soluções Nutritivas: Sintomas de deficiência e funções dos minerais em plantas cultivadas em solução nutritiva

Sintomas de deficiência e funções dos minerais em plantas cultivadas em solução nutritiva.

 

Para uma reflexão e análise crítica: O novo, pode não ser tão novo assim!!!!!!!

        Estamos disponibilizando uma publicação feita em 1938, por Hoagland & Arnon, na qual apresenta uma revisão histórica, obviamente, ate aquele ano, sobre o cultivo hidropônico. A seguir apresentamos apenas um aperitivo do conteúdo, mostrando o prefacio dessa publicação circular, mas a integra do seu conteúdo pode ser obtida clicando no link a seguir. Vale a pena a leitura dessa publicação, quando nos dias atuais, não valorizamos ou desconhecemos, a cronologia histórica  das bases do conhecimento científico e tecnológico, de cada época,  relacionadas aos diferentes temas da fisiologia vegetal, aqui particularmente, o da Nutrição Mineral de plantas e o uso da hidroponia como tecnica de cultivo, para fins cientificos e comerciais. Fazer uma análise critica do que seja uma informação  atual e recente,  e da importância dos conhecimentos, especialmente da química, é  sempre muito prudente e faz bem para dar juízo as ações, atuais e futuras, que satisfazem os nossos egos, sem desestimular a nossa auto-estima de docente e de pesquisador.

HOAGLAND, D.R.; ARNON, D.I. The water-culture method for growing plants without soil. California Agricultural Experimental Station. Circ. n.347, 1938.

THE WATER-CULTURE METHOD FOR GROWING PLANTS WITHOUT SOIL
D. R. HOAGLAND1 and D. I. ARNON2

1 Professor of Plant Nutrition and Chemist in the Experiment Station.
2 Instructor in Truck Crops and Junior Plant Physiologist in the Experiment
Station.

FOREWORD

For approximately a quarter of a century, the California Agricultural Experiment Station has conducted investigations of problems of plant nutrition with the use of water-culture technique for growing plants, as one important method of experimentation. The objective has been to gain a better understanding of fundamental factors which govern plant growth, in order to deal more effectively with the many complex questions of soil and plant interrelations arising in the field. Many workers have participated in these investigations. One of them, Dr. W. F. Gericke, conceived the idea some time ago that the water-culture method, hitherto employed only for scientific studies, might be adapted to commercial use, and proceeded to devise special technique for this purpose. This development was soon given widespread publicity in newspapers, Sunday supplements, and popular journals. The possibility of growing plants in a medium other than soil intrigued many persons, and soon extravagant claims were being made by many of the most ardent proponents of the commercial use of the water-culture method. Furthermore, amateur gardeners sought to make this method a new hobby. Thousands of inquiries came to the University of California for detailed information for general application of the water-culture method to commercial as well as to amateur gardening. Because of doubts expressed concerning many claims made for the use of the water-culture method as a means of crop production, it became evident that an independent appraisal of this method of growing crops was highly desirable. I therefore requested Professor D. R. Hoagland and Dr. D. I. Arnon to conduct certain additional investigations and to  repare a manuscript for a popular circular on the general subject of the growth of plants in water culture. In view of the complexity of the whole problem of the use of the waterculture method commercially or by amateurs, the Station can make no general recommendations at the present time. Those who wish to experiment with the water-culture method on their own responsibility, however, are entitled to the benefit of such information as is now available from the researches of the Station.
The purpose of this circular is to present that information. C. B. Hutchison, Director
Agricultural Experiment Station