Effects of water and nitrogen supply on growth, water-use efficiency and mucilage yield of isabgol (Plantago ovata Forsk)

Abstract

A two-way factorial experiment based on a randomized complete design (RCD) with four replications was used to compare four levels of N supply including control (N 0 ), 60(N 60 ), 120(N 120 ) and 180(N 180 ) mg N per Kg soil and four different water supply including 100(I 100 ), 80(I 80 ), 60(I 60 ) and 40(I 40 ) % FC on growth, water-use efficiency and mucilage yield of isabgol. Under I 40 , higher N addition led to a significant decrease in root and shoot DM. N addition increased root and shoot biomass especially in I 80 treatment followed by I 60 . The highest (1.71 g plant -1 ) and the lowest (0.42 g plant -1 ) seed yield of isabgol observed in I 100 at N 120 and I 40 at N 120, respectively. The concentration of soluble sugar increased with N supply at I 100 and I 40 . Water stress led to an increase in proline levels, particularly in the N supply treatments. The addition of N tended to reduce the positive effect of water stress on proline content. Seed water use efficiency (WUEg) of isabgol decreased with the increase in drought stress. N supply significantly increased WUEg from N 0 to N 120 with no significant differences between N 60 and N 120 and then significantly decreased by supplying N 180 . Mucillage water use efficiency (WUEm) is also increased linear in all watering regime at all N supply.

Automatically controlled deficit irrigation of lettuce in “organic potponics”

“…The chlorophyll content data measured on the 15 th DAT (Figure 2) are consistent with other studies that showed increased chlorophyll content with drought (Weih et al, 2011;Rahimi et al, 2013), which is possibly the effect of concentration due to the lower growth observed for the leaves. Nevertheless, the literature reports the opposite, i.e., drought adversely affecting the chlorophyll content (Kiani et al, 2008;Massacci et al, 2008;Jaleel et al, 2009), and in these cases the drought is generally more severe than that imposed in the present study.…”

EFFECT OF IRRIGATION RATES AND POTASSIUM FERTILIZATION ON GROWTH AND CHEMICAL COMPOSITION OF MOGHAT (Glossostemon bruguieri, Desf) GROWN IN SANDY SOIL

“…There is an inverse relationship between mucilage and irrigation: declined irrigation leads to higher percentage of mucilage and vice versa. Rahimi et al (2013) previously reported similar results, since they found that drought stress increased mucilage percentage of Plantago ovata and Plantago psyllium plants. In addition, Shafeek et al (2015) stated that the highest percentage of mucilage resulted from the lowest irrigation level and the lowest percentage of mucilage resulted from the highest irrigation level, displaying an inverse relationship between irrigation and mucilage production in Plantago ovata plant.…”

Mode of Managing Nutrient Solution Based on N Use Efficiency for Lettuce (Lactuca sativa L.)

“…WUE is one of the functional indicators strongly related to plant growth and health under water deficit condition, it is dependent on the amount of water usedfor growth and biomass production [9]. The experiment showed that WUE is higher in treatments where we find the M 3 .…”

“…This shows that how much less is the amount of nutrient solution used to supply the higher will be the WUE. Many previous studies have observed that WUE was improved under water limitation [9]. The effects of the three modes of replacing the nutrient solution and three initial pH values and their interaction on the WUE of the lettuce plant were significant (Table 3).…”