EFFECT OF DIFFERENT CLIPPING TIMES AND NITROGEN FERTILIZER ON FORAGE YIELDS AND ITS COMPONENTS OF TWO SIX – ROWED BARLEY VARIETIES AT TWO LOCATIONS OF SULAIMANI REGION

Abstract

The availability of green forage to the livestock is one of the most important problems, especially in winters. The aim of this study was to determine the effect of different clipping times and nitrogen fertilizer on forage yields and its components of two six- rowed barley varieties at two locations of sulaimani region. The experiments were conducted in two different locations, the first was at College of Agricultural Sciences-University of Sulaimani located (Latitude: 35˚ 33ʹ; N, Longitude 45˚ 27ʹ; E, at altitude of approximately 830 m), and the second at Bazian location, which is situated 22.8 Km Southwestern of Sulaimani city with 814 m altidute above sea level during the winter season of 2014-2015 by using RCB design with split split plot arrangement with 3 replications. Two levels of nitrogen (40 and 80 kg/ha) as the main factor and two varieties of Barley (Ibba-99 and Local) as sub plots and four clipping times (no clip, clip 1, clip 2, and clip 3) as sub sub-plots were investigated. Means comparison were carried out using least significant difference test (LSD) at 0.05 significant levels. The results indicated that the forage yield and forage yield components of barley were significantly affected by nitrogen fertilizer, varieties and clipping time’s treatment, and the interactions between treatments also significant for most traits at bakrajo and bazian location. The treatment of 80 kg N/ha fertilizer gave the highest forage yield and forage yield components but for dry matter percent the effect was not significant. Ibba-99 variety performance was better than Local variety in most forage yield and its components. The treatment of third clipping time outyielded the first and second clipping times due to all fresh, dry forage yield, dry matter percent and most forage yield components, and concerning leaves/stem ratio the second clipping time gave the highest ratio. Regarding the interaction between the treatments, N2 (N80 kg/ha) fertilizer with Ibb-99 variety and third clipping time recorded maximum value, while N1 (N40kg/ha) fertilizer with local variety and first clipping time gave minimum value of most traits.