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Articles by Rahmatullah
Total Records ( 5 ) for Rahmatullah
  Rahmatullah , G. Nabi , M. Salim and M.S. Zia
  Field experiments on two Alfisols at different locations were conducted to study the response of Westar and CON-I varieties of Brassica napus to S application (0 and 37 kg ha-1) as ammonium sulphate, gypsum and single superphosphate. Various S fertilizers, Brassica varieties and location of the experiment had a significant (p<0.05) main and interactive effect on the grain and oil yield of Brassica. Different S-amendments in increasing grain yield of Brassica followed the order: ammonium sulphate > gypsum > single superphosphate. Westar was a better grain-yielding and a more S-responsive variety of Brassica than CON-I. Both grain and oil yield of Brassica were higher on a site (Fateh Jang) containing low CaCO3 and high plant-available P. Sulphur concentration in seed was found in strong antagonism with seed P (r= -0.79, n= 16).
  M. Salim , Rahmatullah and G. Nabi
  Three wheat cultivars (Pak-81, Punjab-85 and Inqlab) were grown in solution supplied with low (10 μ m) and high (100 μ m) levels of P at 0 and 100 mM NaCl salinity. Root medium salinity depressed the growth of all the three cultivars. Phosphorus supply in the root medium altered the growth depressing effects in the three cultivars to variable extent. Root behaviour of the three cultivars also differed with P application and salinity. In all the three cultivars, the relative rates of Na uptake were significantly decreased with increasing P supply to roots.
  G. Nabi , M. Salim and Rahmatullah
  A field experiment was conducted to evaluate the response of groundnut (cv. Bard 699) to N, P and S application on a Typic Torrior Then soil. Application of N and P significantly (p < 0.05) improved kernal and dry matter yield of groundnut. Addition of S either from potassium sulphate (SOP) or single superphosphate (SSP) further increased groundnut yield. However, S addition from SOP yielded 15 Per cent higher than SSP. Superiority of SOP over SSP was attributed to its quicker release rate of nutrients and hence better utilization by the plants. Nevertheless, combined application of N, P and S increased groundnut yield by 57 to 63 Per cent over control. It is concluded that combined application of S with N and P is beneficial for rainfed groundnut.
  Screening cultivars to grow under conditions of low phosphorus (P) availability and utilize P efficiently from compounds of low solubility in soils may be beneficial to overcome poor plant growth in P-deficient soils. The growth behavior and P utilization efficiency of seven wheat cultivars grown in hydroponics were studied, using rock phosphate as P source. The wheat cultivars grown for 30 days were significantly different in biomass accumulation, P uptake and P utilization efficiency. The dry matter production of all the cultivars was significantly correlated with P uptake, which in turn correlated to the drop in the root medium pH. The ranking of wheat cultivars on the basis of dry matter yield, P uptake and P utilization efficiency was Zamindar 80 > Yecora > C 271 > WL 711 > Barani 83 > PARI 73 > Rohtas. The cultivar Zamindar 80 appeared to possess the best growth potential in P-deficient soils.
  A hydroponics experiment was conducted to evaluate the role of potassium (K) and silicon (Si) in mitigating the deleterious effects of NaCl on sugarcane genotypes differing in salt tolerance. Two salt-sensitive (CPF 243 and SPF 213) and two salt-tolerant (HSF 240 and CP 77-400) sugarcane genotypes were grown for six weeks in ½ strength Johnson's nutrient solution. The nutrient solution was salinized by two NaCl levels (0 and 100 mmol L−1 NaCl) and supplied with two levels of K (0 and 3 mmol L−1) and Si (0 and 2 mmol L−1). Applied NaCl enhanced Na+ concentration in plant tissues and significantly (P ≤ 0.05) reduced shoot and root dry matter in four sugarcane genotypes. However, the magnitude of reduction was much greater in salt-sensitive genotypes than salt-tolerant genotypes. The salts interfered with the absorption of K+ and Ca2+ and significantly (P ≤ 0.05) decreased their uptake in sugarcane genotypes. Addition of K and Si either alone or in combination significantly (P ≤ 0.05) inhibited the uptake and transport of Na+ from roots to shoots and improved dry matter yields under NaCl conditions. Potassium uptake, K+/Na+ ratios, and Ca2+ and Si uptake were also significantly (P ≤ 0.05) increased by the addition of K and/or Si to the root medium. In this study, K and Si-enhanced salt tolerance in sugarcane genotypes was ascribed to decreased Na+ concentration and increased K+ with a resultant improvement in K+/Na+ ratio, which is a good indicator to assess plant tolerance to salt stress. However, further verification of these results is warranted under field conditions.
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