scholarly journals Studies on the Seed Production of Soybean : II. Effect of three major nutrient elements supply and leaf age on the photosynthetic activity and diurnal changes in photosynthesis of soybean under constant temperature and light intensity.

1965 ◽  
Vol 33 (4) ◽  
pp. 437-442 ◽  
Author(s):  
Mutsuo OJIMA ◽  
Juro FUKUI ◽  
Iwao WATANABE
Keyword(s):  
Light Intensity ◽  
Seed Production ◽  
Constant Temperature ◽  
Photosynthetic Activity ◽  
Leaf Age ◽  
Nutrient Elements ◽  
Diurnal Changes ◽  
Major Nutrient

scholarly journals Effects of Photosynthetic Activity Radiation (PAR) on Green Mustard Plant Growth (Brassica rapa var. parachinensis L.)

2019 ◽  
Vol 20 (1) ◽  
pp. 19
Author(s):  
Ni Nyoman Ratini ◽  
I Wayan Supardi ◽  
Yuli Nurfadhillah
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Plant Height ◽  
Photosynthetic Activity ◽  
Plant Biomass ◽  
Vegetative Phase ◽  
Active Radiation ◽  
Blue Filter ◽  
Mustard Plant ◽  
Number Of Leaves

A research on the effect of photosynthetic active radiation (PAR) on the growth of green mustard plants has been conducted. The radiation source used is sunlight. Samples have been grouped as a sample which treated by red filter (P1), by orange filter (P2), by purple filter (P3), by green filter (P4), by blue filter (P5) and a sample without filter as a control (P0). Each sample consisted of four plants. The planting was carried out using polybags with compost media. Observations were made from the nursery phase to the slow vegetative phase (day 3rd, when all plants had grown shoots until day 63rd of the harvest). Parameters measured include light intensity, plant height and number of leaves. Measurement is done every three days. Also it measured plant biomass on the last day of observation (63rd day). The results showed that the intensity of each sample had an impact on the harvest. The best growth rate is obtained in P2, both in the nursery phase and fast vegetative phase i.e. 0.119 cm/day and 0.194 cm/day, respectively. While the highest growth rate was obtained in the P3 sample, namely the slow vegetative phase (0.035 cm/day). Overall the best planting results were obtained in P2 samples with plant height of 23.18 cm, number of leaves of 12 strands and plant biomass of 33.56 g.

Absorption and transport op iron in plants as influenced by the major nutrient elements

1979 ◽  
Vol 1 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Durga Prasad Pandey ◽  
Seshadri Kannan
Keyword(s):  
Nutrient Elements ◽  
Major Nutrient

Is leaf age a predictor for cold tolerance in winter oilseed rape plants?

2020 ◽  
Vol 47 (3) ◽  
pp. 250 ◽  
Author(s):  
Ali Doǧru ◽  
Hüsnü Çakırlar
Keyword(s):  
Low Temperature ◽  
Oilseed Rape ◽  
Cold Exposure ◽  
Photosynthetic Activity ◽  
Leaf Age ◽  
Fluorescence Yield ◽  
Antioxidant Enzyme Activities ◽  
Winter Oilseed Rape ◽  
Fluorescence Measurements ◽  
Young Leaves

In the present study, low temperature-dependent physiological changes were investigated through photosynthetic activity and some endogenous mechanisms in two winter oilseed rape cultivars (Brassica napus L. ssp. oleifera cvv. Eurol and Hansen) on the basis of leaf age. Chlorophyll fluorescence measurements demonstrated that low temperature caused decreased photosynthetic activity in both cultivars. However, photosynthetic apparatus in the young leaves of Hansen is more tolerant to low temperature as demonstrated by lower F0 (minimum fluorescence yield) and 1–qp (excitation pressure of photosystem II), higher Fm (maximum fluorescence yield), Fv/Fm and non-photochemical quenching (NPQ) compared with Eurol. In addition, young leaves of Hansen represented marked increase in some antioxidant enzyme activities (superoxide dismutase (SOD), ascorbate peroxidase (APX) and glutathione reductase (GR)) during cold exposure. In the young leaves of Eurol, however, APX and GR activity was decreased by low temperature, indicating lower efficiency of ascorbate-glutathione cycle. Lower antioxidant activity in the young leaves of Eurol may be responsible for increased malondialdehyde (MDA), H2O2 and membrane damage and decreased chlorophyll content as a result of oxidative damage during cold exposure. In the cold-stressed mature leaves, both cultivars represented similar antioxidant capacities and photosynthetic efficiency. As a consequence, coordinated increase in SOD, APX and GR activities, increased capacity to keep quinone A (QA) in an oxidised state (as indicated by lower 1–qp) and accumulation of soluble sugar and proline could be mainly attributed to higher level of tolerance of the young leaves of Hansen to low temperature when compared with Eurol.

Leaf age and light intensity affect gas exchange parameters and photosynthesis within the developing canopy of field net-house-grown papaya trees

2014 ◽  
Vol 165 ◽  
pp. 365-373 ◽  
Author(s):  
Ren-Huang Wang ◽  
Jer-Chia Chang ◽  
Kuo-Tan Li ◽  
Tzong-Shyan Lin ◽  
Loong-Sheng Chang
Keyword(s):  
Gas Exchange ◽  
Light Intensity ◽  
Leaf Age ◽  
Gas Exchange Parameters ◽  
Exchange Parameters

Effect of cocoa pod ash on the growth of maize

1994 ◽  
Vol 122 (1) ◽  
pp. 31-33 ◽  
Author(s):  
H. K. Adu-Dapaah ◽  
J. Cobbina ◽  
E. O. Asare
Keyword(s):  
Zea Mays ◽  
Rainy Season ◽  
Dry Matter ◽  
Field Experiments ◽  
Nutrient Elements ◽  
Agronomic Efficiency ◽  
Arable Crops ◽  
Optimum Rate ◽  
Major Nutrient ◽  
Muriate Of Potash

SUMMARYPot and field experiments were conducted at the Faculty of Agriculture Arable Crops Farm, Kumasi, Ghana during the major rainy season to compare the agronomic efficiency of potassium in cocoa pod ash with that of muriate of potash and to determine the optimum rate of application of cocoa pod ash to maize (Zea mays L. cv. La Posta). Results from the two experiments indicated that the application of 90 kg N/ha and 67 kg P2 O5/ha did not increase shoot dry matter (DM) yield over the control. However, significant increases in DM yield over the control were obtained when N and P were applied together with 56 kg K2O/ha, demonstrating the complementarity of the major nutrient elements N, P and K. Shoot and root DM increased with increasing application of cocoa pod ash. Application of 140 kg/ha cocoa pod as (equivalent to 56 kg K2O/ha) produced the same DM and shoot potassium yields as 56 kg K2O/ha as muriate of potash. The optimum rate of application of cocoa pod ash was 280 kg/ha (112 kg K2O/ha).

Leaf age, leaf blade portion and light intensity as determinants of leaf photosynthesis inPanicum maximum Jacq.

2015 ◽  
Vol 61 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Bruno C. Pedreira ◽  
Carlos G. S. Pedreira ◽  
Márcio A. S. Lara
Keyword(s):  
Light Intensity ◽  
Leaf Blade ◽  
Leaf Age ◽  
Leaf Photosynthesis

Sperm Transfer in Gypsy Moths: Effect of Constant or Cyclic Temperature and Constant Light or Darkness during the Pupal Stage

1997 ◽  
Vol 32 (3) ◽  
pp. 321-331 ◽  
Author(s):  
F. I. Proshold
Keyword(s):  
Light Intensity ◽  
Constant Temperature ◽  
Lymantria Dispar ◽  
Pupal Stage ◽  
Sperm Transfer ◽  
Constant Light ◽  
Constant Darkness ◽  
Gypsy Moths ◽  
Cyclic Temperature ◽  
Full Complement

Sperm transfer and fertility of the gypsy moth, Lymantria dispar (L.), held as pupae under constant temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h were compared with males held in cyclic temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h. Constant temperature and constant light or darkness severely reduced its ability to transfer sperm. Males held under constant light were more severely affected than males held in darkness, but sperm transfer was not correlated with light intensity (between 80 and 3960 lux). Nearly all males held under constant light and most held under constant darkness were sterile or partially sterile. In either case, sterility was caused by poor sperm transfer. Females with a full complement of sperm were fertile regardless of holding condition of male pupae. The sterilizing effect of constant light or darkness was overridden by cyclic temperature of 28°C for 16 h and 22°C for 8 h. At a photoperiod of 16:8 h, pupae held in constant 28°C transferred less sperm than those held at 25°C. Pupae held at constant 30°C were sterile, but those held at 30°C for 16 h and 25°C for 8 h transferred similar quantities of sperm as males held at constant 28°C.

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