Effect of N-Forms and Some Bio-Stimulants on Productivity of Cucumber: 1-Vegetative Growth and Chemical Constituents.

Abstract

Two field experiments were carried out in a private farm at El-Mahalla El-Kubra, Gharbia governorate during the two successive summer seasons of 2011 and 2012. The aim was to investigate the effect of nitrogen fertilization forms i.e ammonium sulphate and calcium nitrate and some bio-stimulants i.e humic acid, fulvic acid, EM and yeast extract under high temperature on vegetative growth parameters and chemical constituents in leaves of cucumber (Cucumis sativus L.) cv. Prince. The obtained results showed that the effect of N-forms was significant on all vegetative growth parameters and chemical constituents of cucumber plants. The maximum values of these parameters were executed for the treatment of (50%NH4 + 50%NO3). As for foliar spraying of cucumber, plants with bio-stimulants significantly increased the mean values of the vegetative growth parameters and chemical constituents as compared to the control treatment. The best foliar application were yeast extract at 10 g/l or effective Microorganisms (EM) at 20 ml/l. Therefore, using nitrogen fertilization as (50% NH4 +50% NO3) combined with spraying yeast extract at 10 g/l or effective Microorganisms (EM) at 20 ml/l could be recommended in case of high temperature conditions. Keywords: Cucumber (Cucumis sativus)vegetative growth parameterschemical constituents of leaves-N-forms NH4:NO3bio-stimulantshumic acidfulvic acid-effective Microorganisms (EM)yeast extracthigh temperature.

Effect of Tuber Soaking Periods with some Activators on Growth and Productivity of Potato

“…The positive effect on all parameters allied with Zn+B may be attributed to its role in building up IAA that promote cell division and cell elongation (El-Tohamy and El-Greadly, 2007) and affect on meristematic growth which enhance plant growth with enhancing chlorophyll formation by effect on enzymatic role thus led to increase synthesis of carbohydrates and protein and their transport to storage tuber hence increase potato yield and quality. These findings are in agreement with Singh and Tiwari (2013) The promotive effect of yeast extract may be due to its contain of nutrients, vitamin b, cytokinins (Nagodawithana, 1991) that increase metabolic processes, photosynthesis process, assimilates supply and endogenous hormones which increase vegetative growth (Hamail et al, 2014) and promote mineral translocation to storage parts thus reflected to increase yield and quality. These observation agrees with the reports of Dawa et al (2014)…”