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Articles by R. Ahmad
Total Records ( 9 ) for R. Ahmad
  M. Asghar , M. Sadiq , S. M. Mehdi , M. Sarfraz , G. Hassan and R. Ahmad
  The results indicated that maximum yield of paddy was obtained from those plots which were transplanted on 20th July except 1997 where 5th August date gave the maximum but non-significant yield. Among the varieties Shaheen performed better than others. Straw yield decreased with the delay in transplanting irrespective of season. Maximum straw was produced when the lines/varieties were transplanted on 20th June followed by 5th July, 20th July and 5th August in all the years. Among the lines/varieties tested Shaheen produced the least straw. The results indicated that maximum yield of paddy was obtained from those plots which were transplanted on 20th July except 1997 where 5th August date gave the maximum but non-significant yield. Among the varieties Shaheen performed better than others. Straw yield decreased with the delay in transplanting irrespective of season. Maximum straw was produced when the lines/varieties were transplanted on 20th June followed by 5th July, 20th July and 5th August in all the years. Among the lines/varieties tested Shaheen produced the least straw.
  S.M. Mehdi , N. Sajjad , M. Sarfraz , R. Ahmad , M. Asghar and G. Hassan
  The results indicated that grain and straw yields, P concentration in grain and P uptake by grain and straw was increased significantly over control by the application of different sources of phosphorus. All the sources remained at par with each other in all the characteristics studied. However a careful scrutiny of the data showed maximum grain straw yields, P concentration in grain and straw and P uptake by grain and straw were with TSP followed by SSP, N/P and DAP. TSP appears a better source of phosphorus in mildly saline sodic soil.
  Amir Zaman Khan , M. Akhtar , R. Ahmad , N. Ahmad and P. Shah
  Protein and oil contents of soybean varieties were significantly affected by planting date and plant density. Late planted crop gave more protein content than early planted crop, while an inverse relationship was found for oil content. Lower plant density of 200 thousand plants ha -1 gave significantly more protein content than higher plant densities of 400 and 600 thousand plants ha -1 and the same response was observed for oil content but the difference among the plant densities did not reach the 5% significance level. Epps produced more protein and oil contents than William-82. There was no effect of plant density on Oil concentration in seeds of William -82, however Oil concentration in seeds of Epps decreased with increase in plant density, indicating differential response of Oil concentration in seeds of the two soybean varieties.
  M. A. Naeem , R. H. Qureshi , M. Aslam , R. Ahmad , N. Ahmad , A. Hussain , M. Saleem and K. Hussain
  In order to determine genetic diversity of NRI against NaCl salinity, a study in hydropnic system was carried out with 60 plants of NRI at 70 ml m-3 NaCl salinity. Plants were grown up to maturity and on the basis of growth and paddy yield, the plant population of NR-I was divided into five tolerance classes and corresponding values of K+, Na+, Cl-, K:Na and P:Zn ratio were averaged and relationships of these parameters with the salt-tolerance character was evaluated. The study revealed that salt tolerance of various population groups was correlated with the exclusion of Na+ and Cl-, better maintenance of K+, high K:Na and low P:Zn ratios in the leaves. The chemical composition of leaves depends upon the age of the leaf.
  M. A. Naeem , R. H. Qureshi , M. Aslam and R. Ahmad
  Salt tolerance is a complex phenomenon and external Zn:P ratio seems to be related to the salinity tolerance of rice. A study on two rice lines with varying salinity tolerance was conducted in solution culture with different enternal Zn:P ratios in the presence (70 mol m-3 NaCl) and absence of NaCl salinity. A high Zn concentration under saline conditions as compared to in the normal Yoshida nutrient solution was required for better yield. Better growth of rice under different external Zn:P ratios was apparently related to the ionic composition of the leaf sap: there was an inverse relationship with moderately high Zn concentration (Zn:P ratio of 2.1000) in the external medium and the concentration of Na+ and Cl, P and Ca2+, and a positive relationship with K+ and Zn concentrations. It also improved the K+:Na+ ratios in the leaf.
  F.M. Tahir , M.A. Pervez and R. Ahmad
  Potential of using Indole Butyric Acid (IBA) and paclobutrozol (PBZ) for rooting in stem cuttings of guava (Psidum guajava L.) was evaluated in a field study during the year 1995-1996. Two concentrations (500 and 750 ppm) each of IBA and PBZ were applied to three i.e. hard wood, semi-hard wood and softwood types of guava cuttings. Hard wood cuttings and IBA @ 500 ppm performed well with respect to various root and shoot developmental characteristics followed by the IBA @ 750 ppm.
  F.M. Tahir , M.A. Pervez and R. Ahmad
  Present studies were carried out to determine the effect of different nitrogen sources on various chemical characters of guava to improve its quality. Two sources (urea and ammonium nitrate) of nitrogen each with two doses (300 and 600 gm) were applied in split doses before flowering and after fruit setting. It was observed that 600 g N per tree from urea proved best for quality improvement followed by ammonium nitrate. The combined application of urea and Ammonium nitrate (300 + 300 g) was found better than their individual effects with the same dozes.
  A. Tanveer , M. Ayub , R. Ahmad and A. Ali
  A field study was conducted to evaluate the effect of adding a wetting agent to 2, 4-D on weed control in wheat. Triton @ 200 and 250 was used as wetting agent with recommended (1.3 kg ha-1) and reduced rate (1.00 kg ha-1) of 2, 4-D . Weedy check and sole application of 2, 4-D was also included for comparision. Different weed control treatments significantly reduced the weed population compared to weedy check. Appliction of 2, 4-D @ 1.3 kg ha-1 added with wetting agent @ 200 ml kg-1 of 2, 4-D gave 39 per cent more grain yield than weedy check.
  M. Inam-ul-Haq , N. Javed , R. Ahmad and A. Rehman
  Evaluation of different strains of Pseudomonas fluorescent for the biological control of chickpea wilt shows that among 36 rhizobacterial isolates, Isolate 1, Isolate 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 and 36, during in vitro studies, the isolate No. 3, 6, 12, 16, 18, 21, 22, 23, 27, 29 and 33 shows antagonistic activity during inhibition of Fusarium oxysporum f.sp. ciceri by rhizobacterial isolates, whereas by using water culture in test tubes the isolate No. 1, 2, 4, 5 and 9 show antagonistic activity by reducing wilt incidence by 91.67, 94.33, 94.37, 96.00 and 96.00% decrease over control, respectively. In try experiment isolate No. 1, 2, 4, 5 and 9 proved to be the antagonistic ones.
 
 
 
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