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Seasonal dependence of the spectral brightness of agricultural crops on plant chlorophyll content and physiological parameters [Text] / A. F. Sid'ko, A. P. Shevyrnogov // Earth Observ. Remote Sens. - 2000. - Vol. 16, Is. 3. - P487-500. - Cited References: 18 . - 14. - ISSN 1024-5251

РУБ Geography, Physical + Geosciences, Multidisciplinary + Remote Sensing + Imaging Science & Photographic Technology

Аннотация: The paper analyses the results of multi-year studies of the state of agricultural crops based on plant reflectance during the growth period. A universal methodology for determining the physiological state, and plant phytopigment content from the value of the chlorophyll potential S(t) in the region of the red absorption band lambda = 680 nm, which can be determined from the SEC values, is presented. It is shown that addition of mineral fertilisers (and, in particular, nitrogen) to soils, in on average 10 days slows the process of chlorophyll breakdown in phytocoenoses in comparison with control areas.

Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk, Russia : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Sid'ko, A.F.; Shevyrnogov, A.P.

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Biodegradable poly-3-hydroxybutyrate as a fertiliser carrier / T. G. Volova, S. V. Prudnikova, A. N. Boyandin // J. Sci. Food Agric. - 2016. - P4183-4193, DOI 10.1002/jsfa.7621 . - ISSN 0022-5142
Кл.слова (ненормированные):
biodegradable polymers -- controlled delivery systems -- fertilisers -- polyhydroxyakanoates
Аннотация: BACKGROUND: Increasing use of mineral fertilisers can lead to accumulation of fertilisers in soil, water and foodstuffs. One of the approaches to preventing these problems is to develop controlled release forms of fertilisers. RESULTS: Experimental formulations of the nitrogen fertiliser urea loaded in a degradable matrix of the natural polymer poly-3-hydroxybutyrate (P3HB) in the form of films, pellets and coated granules were constructed and investigated. Nitrogen release into soil occurred as the polymer was degraded, and it was dependent on the geometry of the carrier and the amount of nitrogen loaded in it, showing that nitrogen release can last for 30 days or longer and that release rates can be controlled by varying the fabrication technique employed. P3HB/urea formulations have a favourable effect on the soil microbial community. The use of embedded urea has a beneficial influence on the growth of creeping bentgrass (Agrostis stolonifera) and lettuce (Latuca sativa) and reduces removal of nitrogen with drain water. CONCLUSION: The slow-release nitrogen formulations developed in this study can be buried in soil together with seeds preventing nitrogen deficiency. The use of such slow-release formulations can decrease the amounts of chemicals in the environment and prevent their adverse effects on the biosphere. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry

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Держатели документа:
Institute of Biophysics of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Volova, T. G.; Prudnikova, S. V.; Boyandin, A. N.

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