Download Alley Farming (The Tropical Agriculturalist) by B.T. Kang, A.N. Atta-Krah, L. Reynolds PDF

By B.T. Kang, A.N. Atta-Krah, L. Reynolds

Show description

Read Online or Download Alley Farming (The Tropical Agriculturalist) PDF

Similar agricultural sciences books

Soil Liquid Phase Composition

The liquid part of soil (soil resolution) is a truly skinny, penetrating and all-embracing water layer. It has the main wide floor one of the biosphere parts and interacts with a majority of these elements. awarded during this paintings is a brand new complicated method constructed for soil liquid section research that's according to in situ measurements.

Agricultural Development Policy: Concepts and Experiences

Ready below the aegis of the foodstuff and Agriculture association of the United international locations (FAO), this article offers a clean and finished examine agricultural improvement coverage. It offers a transparent, systematic assessment of vital sessions of coverage concerns in constructing nations and discusses the rising foreign consensus on doable techniques to the problems.

Preferential Trade Agreements: How Much Do They Benefit Developing Economies?

This document goals to respond to significant questions: (1) How helpful are the exchange personal tastes supplied to constructing nations; and (2) what are the consequences of attainable erosion of those merits below multilateral exchange liberalisation? The file makes a speciality of alternate personal tastes supplied by means of the so-called Quad international locations (Canada, the eu Union, Japan and the USA) simply because they've got a number of the worlds maximum price lists on agricultural commodities.

Additional resources for Alley Farming (The Tropical Agriculturalist)

Example text

31 0. THOMAS, T. H. (1971). Plant growth regulators and crop production. S. q. , 89, 33-42. CHAPTER 3 THE VEGETATIVE PLANT We have seen in the previous chapter that the early growth of seedlings can be likened to earning compound interest and that this is termed exponential growth. We also saw the prodigious growth of one frond of duckweed (Lemna minor) if it maintains this exponential pattern. It is amusing to use the equations given to calculate how large an area one frond could cover in a year, or even how long it would take to cover the earth's surface.

Natural auxin is a growth regulator, one of many such chemicals which occur in plants. The general nature and types of these plant hormones will now be discussed. 44 Plant Physiology HORMONES Plant hormones are chemical messengers that play a major role in organising growth and development. They are present in plant tissues in very low concentrations but their effect is often immense and dramatic. The presence of hormones was suggested by observation of plant growth long before experiments at the turn of the century eventually proved their existence.

There is good evidence that the roots are not passive in water movement but pump water up the xylem under pressure. The simplest evidence supporting the pumping action of roots is the existence of root pressure. This can be demonstrated on a grand scale by felling trees and measuring the pressure necessary to prevent sap from exuding out of the cut stump. 8). Root pressures of 1 to 2 atmospheres have commonly been recorded and it has been suggested that they may abnormally reach as high as 7 to 8 atmospheres.

Download PDF sample

Rated 4.53 of 5 – based on 30 votes