YIELD RESPONSE OF COTTON TO FOLIAR NITROGEN AS INFLUENCED BY SINK STRENGTH, PETIOLE, AND SOIL NITROGEN

Autor:	B.R. Bondada, Derrick M. Oosterhuis
Rok vydání:	2001
Předmět:	Canopy Physiology Field experiment engineering.material Biology biology.organism_classification Fiber crop Petiole (botany) chemistry.chemical_compound Human fertilization Nitrate chemistry Agronomy engineering Soil fertility Agronomy and Crop Science Malvaceae
Zdroj:	Journal of Plant Nutrition. 24:413-422
ISSN:	1532-4087 0190-4167
DOI:	10.1081/pln-100104969
Popis:	Foliar-nitrogen (N) fertilization based on petiole nitrate concentration during boll development is a widely used production practice in cotton. The objectives of this study were: (1) to examine the response of cotton plants to foliar-N fertilization based on petiole N, two boll loads (low and high), and two soil-N levels (low: 55 kg Nha−1; high: 110 kg N ha−1), and (2) study the effect of soil-N levels on petiole characteristics of the leaf positioned fourth from the top of the canopy. High boll load plants in both soil-N levels had significantly greater yield than low boll load plants. Also, the foliar-N sprays in high boll load plants out yielded the nonfoliar-sprayed high boll load plants grown in high soil-N, as well as, low and high boll load plants growing in low soil-N. Petiole lengths of big leaves in low and high soil-N levels were significantly greater than that of small leaves. The same was true for petiole diameter. Petiole diameter, leaf area, and chlorophyll content of small and big leaves ...
Databáze:	OpenAIRE
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