منابع مشابه
Trace Element Management in Rice
Trace elements (TEs) are vital for the operation of metabolic pathways that promote growth and structural integrity. Paddy soils are often prone to TE limitation due to intensive cultivation and irrigation practices. Apart from this, rice paddies are potentially contaminated with transition metals such as Cd, which are often referred to as toxic TEs. Deficiency of TEs in the soil not only delay...
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متن کاملTrace Element Chemistry Studies
This work was undertaken to measure background silver in Illinois precipitation in the absence of any known seeding operations in or near Illinois. The overall rainfall-weighted mean concentration at several stations was 73 ng/liter. This is somewhat higher than has been found in unseeded precipitation in the western United States, but probably not high enough to preclude identification of silv...
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The oceans are salty. Each litre contains about 35 g of dissolved salts, resulting from the balance between inputs and outputs to the ocean over geological time. The constituents of common salt—Na and Cl—make up more than 90% of this dissolved mass, and together with Mg, S and Ca, represent 99%. Add only three more elements— K, Br and C—and you have more than 999 parts in a 1000 of the dissolve...
متن کاملThe Role of Significance Tests1
The main object of the paper is to give a general review of the nature and importance of significance tests. Such tests are regarded as procedures for measuring the consistency of data with a null hypothesis by the calculation of a p-value (tail area). A distinction is drawn between several kinds of null hypothesis. The ways of deriving tests, namely via the so-called absolute test, via implici...
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ژورنال
عنوان ژورنال: Limnology and Oceanography
سال: 1973
ISSN: 0024-3590
DOI: 10.4319/lo.1973.18.2.0240