Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2007.880.886Oryza sativa L.) Cultivars]]>BahmaniarM.A. RanjbarG.A. AhmadianS.H. 62007106Nutrition elements like nitrogen and potassium are restricting
yield performance of rice cultivars and affecting on their characteristics.
In order to consider effects of different amount of nitrogen and potassium on
yield and chemical compounds of two rice cultivars (Tarrom and Neda which are
landrace and improved Iranian genotypes, respectively), current experiment has
been undertaken in 2004 and 2005. Four levels of nitrogen fertilizer (0, 50,
100 and 150 kg N ha-1 from urea source) and four levels of potassium
fertilizer (0, 75, 150 and 225 kg K2O ha-1 from potassium
sulfate source) have been applied in a split-factorial based on randomized block
design with three replications. Nitrogen fertilizer has been applied in three
different stages of plant growth (
in transplanting,
in tillering and
in flowering initial stages) and potassium fertilizer has also been applied
in two growth stages (½ in transplanting and ½ in shooting stages).
Results indicated that application of nitrogen has increased plant height, number
of tiller, length and width of flag leaf, length of panicle, number of grain
per panicle, grain yield, amount of dry matter, biological yield, harvest index,
leaf potassium, leaf nitrogen, 1000 grain weight and reducing percentage of
hallow grain. Also, applied potassium has positive effects on all of above mentioned
yield components except harvest index and 1000 grain yield. Neda cultivar was
better than Tarrom genotype for most of the measured traits. Interaction of
nitrogen and potassium were affected significantly on number of tiller per plant,
grain yield, amount of dry matter and biological yield in Neda cultivar and
on length of flag leaf, number of grain per panicle, grain yield, amount of
dry matter, biological yield, harvest index and 1000 grain yield in Tarrom genotype.]]>Bansal, S., U. Shahid and S. Mahatim,19939338346Buresh, R.J. and S.K. De Datta,19999113De Datta, S.K. and E.T. Craswell,1982pp: 283-316pp: 283-316Fageria, N.K. and V.C. Baligar,1996451320Fageria, N.K.,19982616Fageria, N.K. and M.P. Borbosa Filho,20013220792089Fageria, N.K. and V.C. Baligar,20013214051429FAO.,20022002Fillery, I.R.P., J.R. Simpson and S.K. De Datta,19898193202Gunes, A., W.H.K. Post and M. Aktas,1995Lactuca sativa L.).]]>39326333Imam, Y. and M. Nicknejad,1994IRRI,1989Kalita, U., N.J. Ojha and M.C. Talukdar,199511203206Kropff, M.J., K.G. Cassman, H.H. van Laar and S. Peng,1993155-156391394Kumar, N. and R. Prasad,200450447454Kundu, D.K., J.K. Ladha and E. Lapitan-de-Guzman,19966011531159Lin, S.C. and L.P. Yuan,1980pp: 35-51pp: 35-51Ojha, N.J. and M.C. Talukdar,2000Oryza sativa) as influenced by levels of potassium and sources of organic matter.]]>11774776Pandey, N., S.S. Tuteja, R. Lakpale and R.S. Tripathi,19939263265Prakasa Rao, E.V.S. and R. Prasad,198057382392Prashad, R. and S.K. de Datta,19791979Prasad, R.,199875677683Prasad, R., S. Singh, V.S. Saxena and C. Devkumar,1999Azadirachta indica Juss) oil for efficient nitrogen use in rice.]]>86538539Qian, X., Q. Shen, G. Xu, J. Wang and M. Zhou,20042710611076Shen, W., G. Zhang, L.W. Gui and R. Szmidt,20032757768Sreemannarayana, B. and A. Sairam,199316246247Wery, J., M. Deschamps and N. Cresson,19881988pp: 287-301pp: 287-301Zhang, C. and G. Wang,200568147154Sidiras, N., C. Avgoulas, D. Bilalis and N. Tsougrianis,1999Vicia sativa cv. Alexander).]]>182209216