Author: Surajit K. De DattaPublisher:
ISBN:
Category : Rice
Languages : en
Pages : 69
Book Description
Biological Constraints to Farmers' Rice Yields in Three Philippine Provinces
Author: Surajit K. De DattaPublisher:
ISBN:
Category : Rice
Languages : en
Pages : 69
Book Description
Biological Constraints to High Yields in Selected Farmers Fields in Iloilo, Philippines
Author: H. C. JerezaPublisher:
ISBN:
Category :
Languages : en
Pages : 142
Book Description
To develop and test methodology for identifying and explaining the gap between the yields obtained by the farmers and those obtained by the researchers at the same sites in Iloilo Province in the Philippines; To develop and apply procedures for identifying the physical factors that influence the adoption and efficient use of technological innovations designed to increase rice yields at farm level; To determine the economics of alternative input levels and practices. A management package concept was used to determine optimum package for maximum economic benefits to the farmers.
Publications of the International Agricultural Research and Development Centers
Author: Publisher: IRRI
ISBN: 9711042169
Category : Agriculture
Languages : en
Pages : 732
Book Description
Nitrogen Economy of Flooded Rice Soils
Author: S.K. de DattaPublisher: Springer Science & Business Media
ISBN: 9400944284
Category : Nature
Languages : en
Pages : 191
Book Description
The steadily increasing cost of nitrogen fertilizer has resulted in more emphasis on basic and applied studies to improve nitrogen use efficiency in lowland rice. The efficiency of fertilizer nitrogen in farmers' fields is shockingly low ~ a luxury resource-scarce farmers in tropical Asia can ill afford. We believe it is critical to quantify the basic transformation processes and develop management practices for higher N use efficiency for two reasons. They are: 1. Nitrogen fertilizer together with water management is a key factor for achieving the yield potentials of modern rices. 2. Fertilizer nitrogen prices are high and most Asian rice farmers are poor. The International Rice Research Institute (IRRI), Philippines; Internation al Fertilizer Development Center (IFDC), USA; Commonwealth Scientific and Industrial Research Organization (CSIRO), Australia; U.S. Universities (Louisiana, Cornell, California, Arkansas and others); and Dr Justus Leibig University in West Germany are actively engaged in individual or collaborative research that addresses basic transformation processes on N gains and losses and management practices to maximize N use efficiency in rice. It is appropriate to update and summarize, in a double issue of Fertilizer Research, the 10 papers presented at the special symposium organized by the American Society of Agronomy (ASA) at the 75th Annual Meeting in Washington, D.C. in 1983. S.K. De Datta, Head of Agronomy Department, IRRI, was chairman of the International Agronomy Division of ASA (A-6) in 1982 and 1983.
Rice Research Strategies for the Future
Author: Publisher: Int. Rice Res. Inst.
ISBN: 9711040611
Category : Rice
Languages : en
Pages : 561
Book Description
Changes in Input Use and Grain Yields in Lowland Rice Farms in Three Philippine Provinces
Author: W. P. AbilayPublisher:
ISBN:
Category : Agricultural innovations
Languages : en
Pages : 24
Book Description
Small Farm Equipment for Developing Countries
Author: Publisher: Int. Rice Res. Inst.
ISBN: 971104157X
Category : Agricultural machinery
Languages : en
Pages : 640
Book Description
The role of small farm equipment; Land preparation; Irrigation; Seeding and planting; Plant protection and soil fertility; Harvesting; Threshing; Grain drying; Improving research and development, manufacturing, marketing, extension and use of small farm equipment.
An Adventure in Applied Science
Author: Robert Flint ChandlerPublisher: Int. Rice Res. Inst.
ISBN: 9711040638
Category : Agricultural innovations
Languages : en
Pages : 250
Book Description
Advances in Soil Science
Author: Publisher: Springer Science & Business Media
ISBN: 1461388473
Category : Technology & Engineering
Languages : en
Pages : 208
Book Description
Soil is formed from physical and chemical weathering of rocks - processes described historically because they involve eons of time-by glaciation and by wind and water transport of soil materials, later deposited in deltas and loessial planes. Soil undergoes further transformations over time and provides a habitat for biological life and a base for the development of civilizations. Soil is dynamic -always changing as a result of the forces of nature and particularly by human influences. The soil has been studied as long as history has been documented. Numerous references to soil are found in historical writings such as Aristotle (384-322 B. c. ), Theophrastus (372-286 B. c. ), Cato the Elder (234-149 B. C. ) and Varro (116-27 B. c. ). Some of the earliest historical references have to do with erosional forces of wind and water. The study of soils today has taken on increased importance because a rapidly expanding population is placing demands on the soil never before experienced. This has led to an increase in land degradation and desertification. Desertifica tion is largely synonymous with land degradation but in an arid land context. Deterioration of soil resources is largely human induced. Poverty, ignorance, and greed are the indirect causes of desertification. The direct cause is mismanage ment of the land by practices such as overgrazing, tree removal, improper tillage, poorly designed and managed water distribution systems, and overexploitation.
IRRI Research Paper Series
Author: International Rice Research InstitutePublisher:
ISBN:
Category : Rice
Languages : en
Pages : 664
Book Description