The effect of nitrogen fertilization rates and the yield components of some Safflower (Carthamus tinctorius L.) in intensive lug in the province of Damascus

This search was carried out in the farm of faculty of Agriculture- Damascus during 2012-2013 to determine the adaption of five Safflower genotypes) Farming conditions in the lug intensive in the province of Damascus under the effect of different nitrogen fertilizers and witness without fertilization N3 . And how they affected safflower accessions morphological traits and productivity.

The phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes

The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e. Damascus and Dir Al-Zor under three nitrogen fertilization levels (130, 195 and 260 of N. ha-1), The nitrogen fertilizer was applied at two splits. Split split plot design was used with 4 replications. Results of phenotypic correlation values showed that grain yield at Damascus location was positively and significantly associated with ear height (r= 0.204**), ear length (r= 0.205**) and number of rows per ear (r= 0.228**). On the other hand, grain yield at Dir Al-Zor location was positively and significantly associated with all studied traits at combined data whereas, it was positively and significantly associated with ear length at three levels and combined data (0.305*, 0.410**, 0.347** and 0.375**, respectively). The data of path coefficient analysis showed that ear length, ear height and number of rows per ear had positive direct effects on grain yield variation and thus grain yield improvement can be achieved through selection for ear length and ear height at Damascus location (11.06%). On the other side, data showed that each of ear height, number of kernels per row and 100-kernel weight had positive direct effects on grain yield variation (32.98%) and thus, 100-kernel weight can be considered as selection criteria may lead to the improvement of grain yield in yellow maize at Dir Al-Zor location.

The phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes

The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e. Damascus and Dir Al-Zor under three nitrogen fertilization levels (130, 195 and 260 of N. ha-1), The nitrogen fertilizer was applied at two splits. Split split plot design was used with 4 replications. Results of phenotypic correlation values showed that grain yield at Damascus location was positively and significantly associated with ear height (r= 0.204**), ear length (r= 0.205**) and number of rows per ear (r= 0.228**). On the other hand, grain yield at Dir Al-Zor location was positively and significantly associated with all studied traits at combined data whereas, it was positively and significantly associated with ear length at three levels and combined data (0.305*, 0.410**, 0.347** and 0.375**, respectively). The data of path coefficient analysis showed that ear length, ear height and number of rows per ear had positive direct effects on grain yield variation and thus grain yield improvement can be achieved through selection for ear length and ear height at Damascus location (11.06%). On the other side, data showed that each of ear height, number of kernels per row and 100-kernel weight had positive direct effects on grain yield variation (32.98%) and thus, 100-kernel weight can be considered as selection criteria may lead to the improvement of grain yield in yellow maize at Dir Al-Zor location.

The phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes

The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e.

Effect of Times and Levels of Nitrogen Fertilization on the Characters of Vegetative Growth, Flowering and the Yield of Summer Squash (Cucurbita pepo L.) c.v. Mullah ahmad

This study was conducted at the vegetable field of department of horticulture and landscape design, college of agriculture and forestry ,Mosul university, during spring of 2007 and 2008, to study the effect of times and levels of nitrogen fertilization on some characters vegetative growth, flowering ,and yield of summer squash .Result indicated that, the time of nitrogen fertilization at the stage of fruit-set caused a significant increased in the leaf number /plant ,length of the plant and the fresh weight/plant. While the time of nitrogen fertilization wasn't affected significantly the total yield. The level at 320 kg.N/ha caused a significant increase of the characters vegetative growth and total yield. Also result revealed that, the interaction between the stage at fruit set and nitrogen fertilization at 320 kg.N/ha led to increase the total yield .The yield was found to positively correlation with the plant length ,fresh and dry weights of plant, leaf area, fruit weight, male and female flowers, and the sex ratio.