The effect of rate, time and utilization method of Nitrogen on Quantative & Qualitative properties of cotton (Cv. Varamin) in non-soline condition of Qom province

• Main Authors: Naeini, Mohammad Reza, Vakil, Reza
• Format: Publication
• Language: Persian
• Published: Karaj (Iran) Soil and Water Reaserch Institute 2006
• Subjects: ABONOS; ALGODON; COTON; COTTON; ENGRAIS; FERTILIZERS; http://www.fao.org/aos/agrovoc#c_1926; http://www.fao.org/aos/agrovoc#c_2867; http://www.fao.org/aos/agrovoc#c_3940; http://www.fao.org/aos/agrovoc#c_5187; IRAN ISLAMIC REPUBLIC; IRAN REPUBLICA ISLAMICA; IRAN REPUBLIQUE ISLAMIQUE; NITRATE; NITRATES; NITRATOS; Qom (Province)

Using of nitrogen in proper rate is one of the most principals of nutrient management in cotton production. Additional nitrogen, caused overgrowing, delayed maturing and increased number of bolls. In order to study, the best rate, time and methods of applying nitrogen, this experiment was conducted in RCBD with 10 treatments and 4 replications during 2005-2006. treatments included: 1- control(not using urea), 2- urea spraying, 3- urea in rate of fertilizers recommendation model of (SWRI) at 3 splits, 4- treatment no3 plus urea spraying, 5- urea in rate of fertilizers recommendation model of (SWRI) at 4 splits 6- treatment no 5 plus urea spraying, 7- urea in rate of 1/2 fertilizers recommendation model of (SWRI) at 3 splits 8- treatment no7 plus urea spraying 9- urea in rate of 1/2 fertilizers recommendation model of (SWRI) at 4 splits 10- treatment no 9 plus urea spraying. Urea spraying was conducted with 3 replication at beginning of bolling with cocentration of 1/100. rate of petoil nitrate measured at phases of first square, begining of flowering and beginning of bolling. Dry weight of plants measured at begining of flowering. finally at harvesting time, measured, height of plants, number of bolls, cotton yield (lint plus seed) and qualitative properties of lint. the result showed that, rate of nitrate was decreased from first square until beginning of bolling. The effect of treatments on fresh and dry weight were not significant and only in treatment of not using urea, decreased fresh and dry weight. The effect rate of urea( 1/2 and complete fertilizers recommendation model of (SWRI)), application time(3 and 4 splits) and urea spraying were not significant on cotton yield, and only in treatment of not using urea, decreased cotton yield, there were no significant differences between treatments from this point of qualitative properties of lint.