Download or read book Diagnostic Soil and Tissue Tests for Evaluating the Nitrogen Nutritional Status of Potato Solanum Tuberosum written by Eduardo Fernandez Tunon and published by . This book was released on 1969 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimisation of Nitrogen and Potassium Nutrition for Selected New Potato Solanum Tuberosum L Cultivars written by Tlotlisang Nkhase and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There are many older potato cultivars in South Africa such as BP1, Up-to-date and Avalanche. These older varieties of potatoes have been studied intensively under South African conditions such that nutrient requirements for such cultivars are well known. However, new cultivars are developed in order to improve yield, increase pest resistance and improve tuber quality, and as well as to meet the industrial market for processing. These newer cultivars are either developed locally or imported into South Africa. Nutrient requirements for these new cultivars have to be known under South African conditions, since nutrient requirements may vary among cultivars and even across regions. Knowledge of the nutritional requirements of such cultivars, especially nitrogen and potassium, which are taken up in largest quantities, are essential to fine- tune production management and improve yield and quality of tubers. Literature suggests that study attempts should not only focus on levels of N and K, but to also investigate N-K interaction (N:K ratios), since yield response to K is related to N status in the soil. For the aforementioned reasons, the study was conducted to evaluate the response of two newer potato cultivars to nitrogen (N) and potassium (K) levels in the South African environment. The studied cultivars were two foreign cultivars, namely Innovator and Lanorma. Two trials were conducted, first, a pot trial and then a field trial as a follow up. The pot trial was conducted between October 2015 to March 2016, while the field trial was conducted from September 2016 to February 2017. The two cultivars were evaluated at four levels of N and four levels of K for the pot trial, which then gave 16 N x K treatment combinations and 16 N:K ratios. The levels of N were 180, 230, 280 and 330 kg.ha-1 and K levels 160, 230, 300 and 370 kg.ha-1. For the field trial, treatments were reduced to three levels of N and K each, i.e. 160, 230 and 300 kg.ha-1 for both N and K, giving seven different N:K ratios. Destructive growth analyses were performed once during the growing season for the pot trial, while for the field trial destructive growth analyses were done four times during the growing season. During each harvest, plant height, dry leaf mass, dry stem mass, stolon length, dry tuber mass and tuber number were recorded. At final harvest, yield, specific gravity, chip colour score and dry matter content were recorded for statistical analysis. SAS was employed in order to perform an analysis of variance and means were separated using the LSD test at 95% probability level. Growth analyses results for both trials showed that Lanorma outweighed Innovator in terms of dry leaf and stem mass. Lanorma was also taller than Innovator and had longer stolons than Innovator. On the other hand, Innovator had a higher total dry tuber mass than that of Lanorma, although Lanorma had more tubers per plant. At final harvest for the pot trial, yield for Innovator was significantly higher than that of Lanorma. Yield for both cultivars were significantly influenced by N:K levels and ratios. N:K ratios ranging between 0.62 to 1.22 showed a tendency of better yield than yields outside that ratio range, provided none of the two nutrients were insufficient. Field trial yield was also influenced by the N:K ratio, similarly to the pot trial. In contrary to the pot trial, Lanorma had a significantly higher yield than Innovator in the field trial. Tuber specific gravity (SG) was also influenced by N:K ratio for both cultivars. For both pot and field trials, N:K ratios around 1.1 or less proved to have better SGs for both cultivars in most cases. Innovator, a processing cultivar, had higher SG values as compared to Lanorma. Yield and tuber size generally increased with increase in N. Yield also increased with increase in K up to 230 kg.ha-1 in most cases, whereafter it then remained constant with further K increase. For the specific conditions, it is recommended that N and K levels be kept at around 230 kg.ha-1 for both cultivars for optimal yield. However, if the priority is to improve tuber quality for processing, then a fertilizer treatment combination of 160 kg.ha-1 N and 300 kg.ha-1 K would be the best option due to lighter chip colour and higher specific gravity associated with that treatment combination.
Download or read book Australian Journal of Experimental Agriculture written by and published by . This book was released on 2003 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil and Plant Tissue Sampling in California written by H. M. Reisenauer and published by UCANR Publications. This book was released on 1978-01-02 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Classic bulletin from 1978 on conducting soil, plant, and water analysis. Detailed instructions for sampling plants, soils, and waters are given, the critical concentrations of nutrients in plant tissues listed, and interpretive guides for soil and water analyses are outlined.
Download or read book Improving Potassium Recommendations for Agricultural Crops written by T. Scott Murrell and published by Springer. This book was released on 2022 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book highlights concepts discussed at two international conferences that brought together world-renowned scientists to advance the science of potassium (K) recommendations for crops. There was general agreement that the potassium recommendations currently in general use are oversimplified, outdated, and jeopardize soil, plant, and human health. Accordingly, this book puts forward a significantly expanded K cycle that more accurately depicts K inputs, losses and transformations in soils. This new cycle serves as both the conceptual basis for the scientific discussions in this book and a framework upon which to build future improvements. Previously used approaches are critically reviewed and assessed, not only for their relevance to future enhancements, but also for their use as metrics of sustainability. An initial effort is made to link K nutrition in crops and K nutrition in humans. The book offers an invaluable asset for graduate students, educators, industry scientists, data scientists, and advanced agronomists.
Download or read book Handbook of Plant Nutrition written by Allen V. Barker and published by CRC Press. This book was released on 2016-04-19 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: The burgeoning demand on the world food supply, coupled with concern over the use of chemical fertilizers, has led to an accelerated interest in the practice of precision agriculture. This practice involves the careful control and monitoring of plant nutrition to maximize the rate of growth and yield of crops, as well as their nutritional value.
Download or read book Plant Nutrition Physiology and Applications written by M.L. Van Beusichem and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 759 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exactly 35 years after the first Colloquium was held, the Eleventh International Plant Nutrition Colloquium took place from 30 July to 4 August 1989 in Wageningen, The Netherlands. Although impressive progress has been made during the past decades in our understanding of the mechanisms of uptake, distribution and assimilation of nutrients in relation to crop yield and quality, there are still significant gaps in our insight into many fundamental aspects of plant mineral nutrition and related metabolic processes. In spite of improved knowledge of nutrient requirements of crops and improved fertilizer application strategies, the world population remains to be burdened with an enormous shortage of plant products for food, timber, fuel, shelter, and other purposes. The main challenge facing the plant nutrition research community is to at least alleviate the increasing world-wide need for applying scientific knowledge to practical problems in agriculture, horticulture, and forestry. It is therefore felt by many scientists that the Plant Nutrition Colloquia, which are intended to bring together scientists and to integrate knowledge and approaches acquired in plant physiology, biochemis try, soil science, agronomy and related disciplines, have indeed made a significant contribution to the advancement of our knowledge and understanding in this vital and interdisciplinary field of agrobiology. About 260 scientists from 40 nations attended the Colloquium in Wageningen.
Download or read book The Potato Crop written by P. M Harris and published by Springer. This book was released on 2013-12-19 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrate Handbook written by Christos Tsadilas and published by CRC Press. This book was released on 2022-01-03 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrate Handbook: Environmental, Agricultural, and Health Effects provides an overview of the entire nitrate cycle and the processes influencing nitrate transformation. It clearly identifies the role of nitrate as an essential nutrient in plant growth, food preservation, and human health. Using the most up-to-date knowledge and research, this handbook illustrates how the steadily increasing human population and demand for food, which results in higher amounts of nitrate needed by soils, makes new regulations on the management and usage of nitrates a high priority. A detailed explanation concerning the discrepancies between the public’s perception of nitrate’s harm versus the reality of its human health benefits is given via a balanced and evidence-based approach. All questions pertaining to the influences of nitrate and its derivatives on plant physiology and human health are explored in depth. This comprehensive resource with contributions from distinguished researches in the field is a must-have for professionals and students who study and work with nitrates. Features: Includes in depth discussion on the wide spectrum of nitrate present in the environment. Focuses on the progress made on nitrate research and its importance. Answers all questions about nitrate and its derivatives’ influences on plant physiology and human health. Enables decision makers and public authorities to manage social concerns Compiles in one resource the findings of many distinguished researchers in the field.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 1842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Potato written by Roy Navarre and published by CABI. This book was released on 2014-12-15 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Potatoes are a staple crop around the world. Covering all aspects of botany, production and uses, this book presents a comprehensive discussion of the most important topics for potato researchers and professionals. It assesses the latest research on plant growth such as tuber development, water use and seed production, covers all aspects of pest management and reviews postharvest issues such as storage, global markets, and of course, nutritional value and flavour.
Download or read book Nutrient Disorders of Sweet Potato written by Jane Nancy O'Sullivan and published by . This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Managing sweet potato nutrition; Disorders producing symptoms mainly on the older leaves; Disorders producing symptoms on leaves of any age; Disorders producing symptoms mainly on the younger leaves; Disorders producing no specific leaf symptoms; Foliar symptoms produced by pathogens and pests.
Download or read book Soil Testing and Plant Analysis written by and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Ecology with R written by Daniel Borcard and published by Springer. This book was released on 2018-03-19 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of Numerical Ecology with R guides readers through an applied exploration of the major methods of multivariate data analysis, as seen through the eyes of three ecologists. It provides a bridge between a textbook of numerical ecology and the implementation of this discipline in the R language. The book begins by examining some exploratory approaches. It proceeds logically with the construction of the key building blocks of most methods, i.e. association measures and matrices, and then submits example data to three families of approaches: clustering, ordination and canonical ordination. The last two chapters make use of these methods to explore important and contemporary issues in ecology: the analysis of spatial structures and of community diversity. The aims of methods thus range from descriptive to explanatory and predictive and encompass a wide variety of approaches that should provide readers with an extensive toolbox that can address a wide palette of questions arising in contemporary multivariate ecological analysis. The second edition of this book features a complete revision to the R code and offers improved procedures and more diverse applications of the major methods. It also highlights important changes in the methods and expands upon topics such as multiple correspondence analysis, principal response curves and co-correspondence analysis. New features include the study of relationships between species traits and the environment, and community diversity analysis. This book is aimed at professional researchers, practitioners, graduate students and teachers in ecology, environmental science and engineering, and in related fields such as oceanography, molecular ecology, agriculture and soil science, who already have a background in general and multivariate statistics and wish to apply this knowledge to their data using the R language, as well as people willing to accompany their disciplinary learning with practical applications. People from other fields (e.g. geology, geography, paleoecology, phylogenetics, anthropology, the social and education sciences, etc.) may also benefit from the materials presented in this book. Users are invited to use this book as a teaching companion at the computer. All the necessary data files, the scripts used in the chapters, as well as extra R functions and packages written by the authors of the book, are available online (URL: http://adn.biol.umontreal.ca/~numericalecology/numecolR/).
Download or read book The Use of Nutrients in Crop Plants written by Nand Kumar Fageria and published by CRC Press. This book was released on 2016-04-19 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Put Theory into Practice Scarcity of natural resources, higher costs, higher demand, and concerns about environmental pollution- under these circumstances, improving food supply worldwide with adequate quantity and quality is fundamental. Based on the author's more than forty years of experience, The Use of Nutrients in Crop Plants
