G. S., KahlonKhushboo Rai2017-06-152017-06-152011http://krishikosh.egranth.ac.in/handle/1/5810020355The present investigations entitled “Pre-bearing response of Kinnow to differential doses and application timings of fertilizers” were carried out in the old orchard and analytical laboratory of the Department of Horticulture, Punjab Agricultural University, Ludhiana during the year 2010. Kinnow plants of uniform size and age were selected in the month of January and differential fertilizer treatments were imposed from February, 2010 onwards. The effect of different fertilizer doses of nitrogen(N), phosphorus(P) and potassium(K) as well as different number of split applications on vegetative growth of plants were observed in terms of plant height, plant spread, stock girth, scion girth, plant volume and leaf colour. The leaf and soil analyses with respect to N, P and K were done to establish the effect of differential fertilizer treatments on plant nutritional status as well as availability of these elements in the soil. There were three sets of fertilizer treatments; the first set (T1) consisted of the standard practice of applying N in two split doses (mid February and mid April). In the second set, there were differential fertilizer treatments (T2 to T7) which were given in four split doses (mid February, mid April, mid June and mid August) and in the third set ( T8 to T13) there were six split doses (mid February, mid March, mid April, mid May, mid June and mid July). The treatment T7 (N125P50K125 in 4 splits) was found to be the best than all the other treatments and it was closely followed by T6 (N125P50K100 in 4 splits) for all the plant growth parameters as well as leaf and soil nutrition status. Application of fertilizer treatments in 4 splits was found to be better than 2 or 6 split doses.ennullThesis