Evaluation the effects of plant growth regulators, plant density and nitrogen on quantitative and qualitative traits of Oilseed rape
Subject Areas : Environmental ecologyمحمد مظفری فر 1 , MOHAMMAD REZA DADASHI 2 , abolfazl faraji 3 , kamal pyghamzadeh 4 , H. Mosanaiey 5
1 - دانشجو دکتری
2 - Department of Agricultural, Gorgan Branch, Islamic Azad University,Gorgan, Iran
3 - استاد
4 - مرکز تحقیقات
5 - Department of Agronomy, Gorgan Branch, Islamic Azad University, Gorgan, Iran
Keywords: sowing pattern, plant density, Superstem, grain and oil yield, Medax top, Brassica napus L.,
Abstract :
Oilseed rape grain yield highly associated with nitrogen rating and plant density in which by increasing in its levels, all other quantitative and qualitative traits would be influenced. The aim of this study was to assessment the effects of plant growth regulators (control, Medax top, Superstem) under different nitrogen rating (based on soil test recommendation, 50% more than soil test recommendation and 100% more than soil test recommendation) and plant density (including 50 and 100 plant per m-2) based on factorial split plot design replicated thrice during 2018-2019 and 2019-2020. The analysis of variance revealed that all evaluated traits was effected by experimental treatments and their interactions (P>0.01), except thousand grain yield. The highest grain yield (2954 kg/ha), oil yield (1040 kg/ha) and protein content (29%) were obtained in 50 plant per m-2×without application of plant growth regulators×50% more than soil test recommendation interaction. Generally, the results depicted that application of plant growth regulators under higher nitrogen and plant density conditions caused growth retardation and decreased plant height, meanwhile it is dwindled grain and oil yield as well as protein content, dramatically.
