Mathematical Models of Crop Growth and Yield

Mathematical Models of Crop Growth and Yield
Author: Allen R. Overman
Publisher: CRC Press
Total Pages: 341
Release: 2002-08-27
Genre: Technology & Engineering
ISBN: 0824743598

Highlighting effective, analytical functions that have been found useful for the comparison of alternative management techniques to maximize water and nutrient resources, this reference describes the application of viable mathematical models in data analysis to increase crop growth and yields. Featuring solutions to various differential equations, the book covers the characteristics of the functions related to the phenomenological growth model. Including more than 1300 literature citations, display equations, tables, and figures and outlining an approach to mathematical crop modeling, Mathematical Models of Crop Growth and Yield will prove an invaluable resource.

The AquaCrop model – Enhancing crop water productivity

The AquaCrop model – Enhancing crop water productivity
Author: Salman, M., García-Vila, M., Fereres, E., Raes, D., Steduto, P.
Publisher: Food & Agriculture Org.
Total Pages: 106
Release: 2021-11-16
Genre: Nature
ISBN: 9251352224

Water resources are linked to the global challenges of food insecurity and poverty, as well as to climate change adaptation and mitigation. In line with the Sustainable Development Goals (SGD), FAO works towards several dimensions of sustainable development, including the promotion of coherent approaches to efficient, productive and sustainable water management, from farm to river basin scales. Accordingly, FAO is enhancing well-informed on-the-ground decision-making processes on water management through projects, knowledge advancement, information-sharing and tools development, such as AquaCrop, the FAO crop-water productivity model. This model assists in assessing the effects of environment (including atmospheric CO2 concentration) and management on crop production through the simulation of yield response to water of herbaceous crops. It is particularly suited to address conditions where water is a key limiting factor in crop production. In 2009, FAO officially launched AquaCrop, being the result of several years of collaborative work among scientists, water and crop specialists and practitioners worldwide, bringing together previously fragmented information on crop yields in response to water use and water deficit. AquaCrop has evolved over the different versions released since its first launch, but it always balances accuracy, simplicity and robustness. This has enabled it to remain faithful to its goal, i.e., to be a dynamic tool accessible to several types of users, mainly practitioner-type end users, in different disciplines and for a wide range of applications. In addition, AquaCrop may be considered a valuable tool by research scientists for analysis and conceptualization.

Crop growth and soil water balance modeling to explore water management options

Crop growth and soil water balance modeling to explore water management options
Author: Ines, A. V. M.Droogers, P.Makin, I. W.Das Gupta, A.
Publisher: IWMI
Total Pages: 35
Release: 2001
Genre: Crops
ISBN: 9290904585

The study was on the performance of the decision support system for agrotechnology transfer (DSSAT) and the soil water atmosphere plant (SWAP) under an acid sulphate soil. The comparison of these models was done as a prerequisite to the selection of an appropriate model, which is capable of simulating water management scenarios, water balance and crop growth, to be coupled with an adaptive optimization algorithm that can be used to explore water management options.

Estimation of Water and Nitrogen Crop Response Functions

Estimation of Water and Nitrogen Crop Response Functions
Author: Sadi Sergio Grimm
Publisher:
Total Pages: 312
Release: 1986
Genre: Irrigation
ISBN:

Since the 1950's the use of polynomial production functions has become almost a standard approach to describe crop response to fertilizers and irrigation water, particularly among agricultural economists. The appropriateness of the polynomial forms is supported on basis of their good predictive ability, since high R2s are usually obtained. They have been used, however, as an approximation tool rather than based on some justification from a theoretical standpoint and, in fact, they contradict the principle of nonsubstitution among essential elements in physiological processes. This study submits to a rigorous hypothesis test the polynomial forms against a factor nonsubstitution model specification in terms of their appropriateness in describing crop response toirrigation water and nitrogen. The polynomial forms used are the quadratic, the three halves and the square root, which are estimated by using conventional multiple linear regression procedures. The basic specification for the factor nonsubstitution model consisted in assuming a linear response with a sharp transition to a plateau type maximum. This linear-plateau specification incorporates the principles of the "law of the minimum", proposed by von Liebig circa 1840. However, several other alternative formulations, assuming nonlinear output increases, are also studied. ...

Water Use in Crop Production

Water Use in Crop Production
Author: M.b. Kirkham
Publisher: CRC Press
Total Pages: 416
Release: 2000-04-05
Genre: Technology & Engineering
ISBN: 9781560220688

Make the best use of available water for your crops! Water Use in Crop Production explores innovative methods that determine how much water certain crops need, in certain climates, in order to ensure adequate plant growth and help eliminate water waste. Through this informative book, agronomists, growers, researchers, and graduate students will find methods and techniques for effective water management that will save money and conserve water. Water Use in Crop Production will enable you enhance crop quality and quantity and save one of the earth's most important resource. Comprehensive and thorough, this essential book combines two vital needs, food and water, and examines what must be done in order to keep up with the ever-growing human population. Explaining conservation techniques used in Argentina, Australia, Israel, Morocco, New Zealand, the Philippines, Spain, and the United States, Water Use in Crop Production will help you achieve this goal as it discusses water management measures including: avoiding excessive deep percolation reducing runoff lessening water evaporation through methods such as reducing the capillary water flow to the surface of the soil determining the rates at which water is demanded and can be supplied in a specific area to create a plan for limiting water loss studying the root structure of plants to calculate how much water they need using deficit irrigation to help plants save water for future use evaluating citrus water use through the Penman-Monteith model Containing charts, tables, and examples of the concepts it discusses, this book is the culmination of the latest studies on water storage. Water Use in Crop Production provides you with reliable strategies and methods that will help you lessen water expenditures and improve the vitality of crops anywhere in the world.