Rosa centifolia is grown for its flowers which are used for essential oil extraction. It is vegetatively propagated through its cuttings which are difficult to root. This study was designed to increase the rooting per...Rosa centifolia is grown for its flowers which are used for essential oil extraction. It is vegetatively propagated through its cuttings which are difficult to root. This study was designed to increase the rooting percentage of cuttings by applying plant growth regulators (PGRs) with different levels. In total 31 treatments with different concentrations (450 ppm, 700 ppm and 950 ppm) of indole butyric acid (IBA), indole acetic acid (IAA), naphthalene acetic acid (NAA) alone, in combination and with same concentrations of 6-benzylamino purine (BAP) were used. Healthy similar sized cutting of R. centifolia was treated in solution of PGRs by quick dip method and planted in polythene bags. The data for shoot length, shoot dry weight, number of roots, root length and root dry weight were recorded. All three levels (450 ppm, 700 ppm and 950 ppm) of IBA alone produced maximum results in case of all parameters as compared to all other treatments. Among three levels of IBA, 450 ppm concentration produced maximum shoot length (10.67 cm), shoot dry weight (3.02 g), number of roots (14.00), root length (11.90 cm) and root dry weight (0.50 g). Lower concentrations of plant growth regulators produced better results as compared to higher concentrations.展开更多
Biostimulants are shown to increase crop production.This study was conducted to investigate the effects of individual biostimulants on tomato('Phoenix')growth and yield.Five biostimulants:CP_(1),CP_(2),BS,CP_(...Biostimulants are shown to increase crop production.This study was conducted to investigate the effects of individual biostimulants on tomato('Phoenix')growth and yield.Five biostimulants:CP_(1),CP_(2),BS,CP_(2)+BS,Competitor,and Water(control)were foliar applied at three different stages:pre-blooming,fruit setting,and color changing.The concentration of calcium(Ca),potassium(K),magnesium(Mg),and phosphorus(P)in leaves and roots were also determined.The results showed that plants treated with biostimulants had greater concentrations of Ca,K,Mg,and P compared to those treated with water only.Competitor and CP_(2)+BS significantly increased yield,plant height,and stem diameter by 76%and 41%,42%and 34%,and 29%and 24%.Likewise,leaf greenness,net photosynthetic rate(Pn),relative water content(RWC),nitrate level in petiole sap,and fruit quality(citric acid,malic acid,tartaric acid,soluble solid concentration,and fruit firmness)were also improved by Competitor.In addition,enzymatic activities of nitrate reductase(NR)and nitrite reductase(NiR)were significantly increased by biostimulants compared to the control.Statistically,Competitor and CP_(2)+BS showed the greatest augmentation in plant height,stem diameter,leaf greenness,PN,RWC,nitrate level in petiole sap,and fruit yield and quality.Similarly,Competitor-treated plants also increased NR,NiR,leaf Ca,leaf K,leaf Mg,and leaf P by 34%,70%,22%,26%,27%,and 45%,respectively.Based on the findings of this study,application of Competitor or CP2+BS showed promising results and may be used as a BMP tool for tomato production in Florida.展开更多
文摘Rosa centifolia is grown for its flowers which are used for essential oil extraction. It is vegetatively propagated through its cuttings which are difficult to root. This study was designed to increase the rooting percentage of cuttings by applying plant growth regulators (PGRs) with different levels. In total 31 treatments with different concentrations (450 ppm, 700 ppm and 950 ppm) of indole butyric acid (IBA), indole acetic acid (IAA), naphthalene acetic acid (NAA) alone, in combination and with same concentrations of 6-benzylamino purine (BAP) were used. Healthy similar sized cutting of R. centifolia was treated in solution of PGRs by quick dip method and planted in polythene bags. The data for shoot length, shoot dry weight, number of roots, root length and root dry weight were recorded. All three levels (450 ppm, 700 ppm and 950 ppm) of IBA alone produced maximum results in case of all parameters as compared to all other treatments. Among three levels of IBA, 450 ppm concentration produced maximum shoot length (10.67 cm), shoot dry weight (3.02 g), number of roots (14.00), root length (11.90 cm) and root dry weight (0.50 g). Lower concentrations of plant growth regulators produced better results as compared to higher concentrations.
文摘Biostimulants are shown to increase crop production.This study was conducted to investigate the effects of individual biostimulants on tomato('Phoenix')growth and yield.Five biostimulants:CP_(1),CP_(2),BS,CP_(2)+BS,Competitor,and Water(control)were foliar applied at three different stages:pre-blooming,fruit setting,and color changing.The concentration of calcium(Ca),potassium(K),magnesium(Mg),and phosphorus(P)in leaves and roots were also determined.The results showed that plants treated with biostimulants had greater concentrations of Ca,K,Mg,and P compared to those treated with water only.Competitor and CP_(2)+BS significantly increased yield,plant height,and stem diameter by 76%and 41%,42%and 34%,and 29%and 24%.Likewise,leaf greenness,net photosynthetic rate(Pn),relative water content(RWC),nitrate level in petiole sap,and fruit quality(citric acid,malic acid,tartaric acid,soluble solid concentration,and fruit firmness)were also improved by Competitor.In addition,enzymatic activities of nitrate reductase(NR)and nitrite reductase(NiR)were significantly increased by biostimulants compared to the control.Statistically,Competitor and CP_(2)+BS showed the greatest augmentation in plant height,stem diameter,leaf greenness,PN,RWC,nitrate level in petiole sap,and fruit yield and quality.Similarly,Competitor-treated plants also increased NR,NiR,leaf Ca,leaf K,leaf Mg,and leaf P by 34%,70%,22%,26%,27%,and 45%,respectively.Based on the findings of this study,application of Competitor or CP2+BS showed promising results and may be used as a BMP tool for tomato production in Florida.
