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Nitrogen Enigma in Tropical Soils. Unravelling the Phenomenon of NH4+ Fixation

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Gaius E.    
Книга по Требованию    
3234 руб
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Potassium (K+) added after N fertilization resulted in the release of "recently" fixed NH4+ being blocked. A series of laboratory investigations and a green house study were conducted to determine the extent and dynamics of fixation of fertiliser N in a range of agricultural soils using 15N techniques. Existing micro-diffusion procedures as a necessary step in the pre-concentration of exchangeable NH4+ and NO3--15N were validated, and new procedures for measuring fixed NH4+-15N fractions (total, strongly and weakly fixed) were developed. In green house studies cropping resulted in a slow release of a small portion (13. 3 %) of the "recently" fixed NH4+ at 42 days after cropping. Laboratory incubations showed fixation to increase linearly with increasing N application rate. These findings should provide agronomist and soil fertility researchers with pertinent information regarding alterations to N management tools and systems. Fixed NH4+ has been shown to occupy a significant portion of the total N of some tropical soils, which may alter and influence the N availability and dynamics in these soils.
Набор шариковых ручек "Ultra Glide Technology U-18", 40 штук, ассорти.
Ручки пластмассовые. Размер ручки: 14 см.
1185 руб
Раздел: Цветные

Мовний дискурс
Виходячи за межі запропонованого повідомлення в дисциплінарну комунікацію адресант залучає (хоча б і подумки) текст-першоджерело і співставляє його з інкорпорованим текстом, в результаті чого адресат іноді приходить до висновків, які не витікають безпосередньо із самого повідомлення. Оскільки усі наукові тексти призначені, перш за все, спеціалістам з широкою базою наукових знань, то і їх характерною ознакою є використання термінів, які стосуються обраної галузі науки ( eu ro , a omic e ergy, chard, bisec or, soil acidi y, coarse-grai ed, as ra um of shale, radio- elescope, mag e ic fields, he solar ebula, carbo -dioxide a mosphere ); специфічних абревіатур (VLB - very lo g baseli e i erfereome ry; ADW - he or h A la ic Deep Wa er; I CZ – he I er ropical co verge ce zo e). Іноді зустрічаються антропоніми, в основному імена відомих науковців, які зробили свій вагомий внесок у становлення та розвиток тієї галузі науки, в межах якої відбувається комунікація (Galileo, Descar e’s Geome ry, Roe ge , Me deleyev’s Periodic Sys em) та номенклатурна лексика – як правило, назви закладів, де проводились дослідження чи їх апробація ( he Joi uclear Research I s i u e, he a io al Aero au ics a d Space admi is ra io , he a io al Ocea ic a d A mospheric Depar me ). Іншим поширеним засобом вираження адресованості є таблиці, які виконують роль пояснення, конкретизації чи узагальнення інформації загального тексту, графіки, функції, діаграми, формули та інші графічно- схематичні засоби.

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