THE EFFECT OF FOLIAR SUPPLEMENTS OF POTASSIUM-NITRATE AND UREA ON THEYIELD OF WINTER-WHEAT

Citation
Pb. Barraclough et J. Haynes, THE EFFECT OF FOLIAR SUPPLEMENTS OF POTASSIUM-NITRATE AND UREA ON THEYIELD OF WINTER-WHEAT, Fertilizer research, 44(3), 1996, pp. 217-223
Citations number
22
Categorie Soggetti
Agriculture Soil Science
Journal title
ISSN journal
01671731
Volume
44
Issue
3
Year of publication
1996
Pages
217 - 223
Database
ISI
SICI code
0167-1731(1996)44:3<217:TEOFSO>2.0.ZU;2-M
Abstract
Winter wheat crops were grown with ostensibly adequate supplies of all soil nutrients in 1990 and 1991 with the aim of testing if late folia r supplements of K and N, applied at key development stages, could imp rove grain yield and grain N content. Foliar sprays of KNO3 solution, supplying up to 40 kg K ha(-1) in total, at flag leaf unfolded, inflor escence completed and the watery-ripe stage of grain filling, had no e ffect on yield, yield components or grain N. Urea, supplying 40 kg N h a(-1) at flag leaf unfolded, had no effects on grain yield and grain N in 1990, but in 1991 grain N was increased by 0.14% whilst yield was reduced by up to 0.6 t ha(-1). Urea scorched flag leaf tips in both ye ars. In 1990, the spring was very dry and foliar supplements might hav e been expected to have had an effect, but on this highly fertile soil all crop K and N requirements were met from the soil.