Download or read book Fertilisation azot e d une rabli re sucre comportement de divers engrais azot s dans le sol written by A. Gonzalez and published by Sainte-Foy, Québec : Centre de recherches forestières des Laurentides, Service canadien des forêts. This book was released on 1985 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engrais written by André Gros and published by . This book was released on 1921 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book L azote et le soufre dans le sol written by Pierre Duc and published by Atlantica Séguier Frontières. This book was released on 1991 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilisation azot e de la pomme de terre written by Caroline Chambenoit and published by Editions Quae. This book was released on 2002 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'azote est un facteur clé dans la production de pomme de terre : une bonne gestion affecte à la fois la rentabilité de la culture et son impact sur l'environnement. Ce guide permet de relier à leurs fondements théoriques les préconisations de fertilisation azotée de la pomme de terre : du calcul de la dose au choix de la forme d'engrais et aux modalités d'apports. Il intéresse les agriculteurs et conseillers agricoles ainsi que les étudiants et enseignants impliqués dans cette culture.
Download or read book Engrais written by André Gros and published by . This book was released on 1957 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book L puisement du sol et les r coltes written by Louis Grandeau and published by . This book was released on 1889 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic Studies of Azolla and Nitrogen Fertilization of Rice written by K.S. Kumarasinghe and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is the most limiting element for crop production. Traditionally, expensive commercial fertilizers are used to correct soil nitrogen deficiencies. Indeed, 50% of the increase in rice yields after World War II can be attributed to increased fertilizer nitrogen use. Although an increased rate of fertilizer nitrogen application has been advocated to meet the growing demand for food, it is unrealistic to advise the farmers to apply fertilizers they could hardly afford, and whose prices are likely to escalate in the years ahead. In addition, when they are not applied judiciously there are problems of environmental pollution as plants are capable of taking up only a relatively small portion of the applied nitrogen, a substantial amount being lost through various chemical and biological processes. The exploitation of cheaper alternatives or supplements to fertilizers have therefore gained much interest in recent years. Our increased interest in biological nitrogen fixation as a supplement or alternative to nitrogen fertilizers led to the convening of a consultants' meeting on `The Role of Isotopes in Studies on Nitrogen Fixation and Nitrogen Cycling by Blue-Green Algae and the Azolla-Anabaena azollae Association', in Vienna from 11--15 October 1982. The consultants' group recommended that the Joint FAI/IAEA Division of Nuclear Techniques in Food and Agriculture embark on a coordinated research programme in this field and that initial emphasis should be placed on Azolla-Anabaena symbiosis. As a result, such a programme was initiated in 1984, which was concluded in 1989. The results and conclusions reported here are those that were generated during the five years of its operation.
Download or read book Nitrogen Fertilization of a Sugar Maple Stand Behavior of Various Nitrogen Fertilizers in the Soil written by A. Gonzalez and published by Sainte-Foy, Quebec : Laurentian Forest Research Centre. This book was released on 1985 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
