http://localhost:80/xmlui/handle/123456789/17340 2026-04-07T03:12:58Z http://localhost:80/xmlui/handle/123456789/18760 Title: ZINC REQUIREMENT OF WHEAT CROP Authors: Chaudkary, Rehman, A.; M. Akram; K. H. Gill; M. Akram Qazi' Abstract: Zinc requirement of wheat crop was investigated through a field experiment laid oat in farmer's field on a zinc (Zn) deficient soil near Kasur in Lahore Division during 1997-98. Levels of Zn (kg ha'1 ) tried were 0, 2.5, 5.0, 7.5, 10.0, 12.5 and 15.0. The data revealed that wheat crop responded significantly to added zinc and 5 kg Zn ha'' appeared to be the optimum dose for conditioning wheat yield under experimental condition. The agronomic efficiency (GNR) reduced with subsequent increase in Zn application level. Zinc contents of wheat grain and straw also supported the finding. 2001-12-14T00:00:00Z http://localhost:80/xmlui/handle/123456789/18759 Title: DIFFERENTIAL GROWTH RESPONSE OF COTTON GENOTYPES INFECTED WITH ROOT ROT TO SILICON NUTRITION Authors: Tariq Aziz; Maqsood Ahmad Gil; Iftikhar Ahmed Abstract: A hydroponics study was carried out to investigate the effect of silicon (Si) on increased tolerance of eleven cotton genotypes against root rot. Pre-germinated seedlings were grown with and without Si in half strength modified Johnson's solution. The genotypes harvested one-month after transplanting, exhibited substantial growth differences in terms of biomass production, leaf Si, phosphorus (P) and potassium (K) concentrations. Inspite of obvious symptoms of root rot in both treatments, shoot and root dry matter was significantly improved by Si addition in the root medium indicating increased tolerance to root rot. Among genotypes, BH-118 performed better with Si addition in term of biomass production. Silicon concentration increased while P and K concentrations decreased significantly in cotton leaves by Si application in the growth medium of cotton genotypes infected with root rot. Shoot dry matter (SDM) correlated positively with root dry matter (RDM) (r = 0.76**) and Si concentration (r = 0.42**) in leaves. 2001-11-12T00:00:00Z http://localhost:80/xmlui/handle/123456789/18758 Title: THE EFFECT OF HARVESTS ON THE YIELD AND QUALITY OF FORAGE OF SALT BUSH (ATRIPLEXES) Authors: Muhammad Aslam; R. H. Qureshi; R. Mahmood; S. Nawaz; Javaid Akhtar Abstract: In Pakistan there are (wo feed gaps per year. During these periods fodder from salt-bush may require frequent grazing. Such frequent grazing/cutting may effect the survival and productivity of salt-bushes. A field experiment in a salt-affected land was thus conducted to measure the effects of frequency and severity of harvesting on the productivity and forage value of two atriplex species. There were three harvesting frequencies (2, 6 and 12 month} and 2 harvesting severities (50% and 100%). These were compared in 4 replications for Atriplex amnicola and Atriplex lentiformis. Seedlings were established for one year before the commencement of harvests. More frequent harvesting of saltbush results in increased annual forage production and low ash contents. No effects of treatments were observed on N, Na and Cl concentration. 2001-11-12T00:00:00Z http://localhost:80/xmlui/handle/123456789/18757 Title: PHOSPHORUS AND ZINC FERTILIZATION OF WHEAT AND RICE Authors: S. M. Mian; M. Akram; K. H. Gill; Z. Ahmad Abstract: Deficiencies in soil zinc (Zn) may limit yield of rice and wheat in rice tract of the Punjab (Gujranwala and Lahore Divisions). The build-up of phosphorus (P) due to its continuous application could also reduce the plant Zn concentration. Therefore, this three seasons study in randomized complete block (Factorial) design investigates the effects of P and Zn fertilizer on yield of wheat and rice (in rotation) and their concentration in plant tissue to predict the specific P and Zn need of the crops. There were two levels of P (100 and 200 kg P2OS ha1) and three levels of Zn i. e. 0, 3.5, and 7 for wheat and 0, 5, and 10 kg ha'for rice. Wheat yield data revealed that Zn addition at the rate of 3.5 kg ha'improved the grain yield significantly while there was no difference in the yield in treatments receiving 100 and 200 kg PiOsha1 . A reverse situation was attained in rice where high P (200 kg PiOf ha') did increase the paddy yield significantly while Zn at the rate of 5 - 10 kg ha'1 was not successful to enhance the yield. The reason was satisfactory levels of soil Zn built-up to 1.6 - 2.8 mg kg ' 'soil due to residual effect of Zn applied to previous crop i.e. wheat. Yield, tissue concentrations, utrients (P & Zn) uptake and soil test levels did not show P induced Zn limitation on this alkaline soil. Higher soil test P and Zn values at the harvest of last wheat season were found in the treatment of 7 kg Zn ha'when applied in combination with 200 kg P2O3 ha 'compared to other treatments. 2001-10-11T00:00:00Z