Impact of reduced light intensity on wheat yield and quality: Implications for agroforestry systems

2021 ◽  
Author(s):  
Jiyu Jia ◽  
Meng Xu ◽  
Shuikuan Bei ◽  
Hongzhi Zhang ◽  
Li Xiao ◽  
...  
Keyword(s):  
Light Intensity ◽  
Wheat Yield ◽  
Agroforestry Systems ◽  
Yield And Quality ◽  
Reduced Light

scholarly journals Study on the Effect of Shading on Performance of Leafy Vegetables

2020 ◽  
pp. 8-24
Author(s):  
Zannatul Firdaus Binte Habib ◽  
Md. Rashedul Hassan ◽  
Nazmun Naher ◽  
Abdul Halim
Keyword(s):  
Light Intensity ◽  
Growth Parameters ◽  
Morphological Characteristics ◽  
Agroforestry Systems ◽  
Leafy Vegetables ◽  
Single Factor ◽  
Full Sunlight ◽  
Shade Condition ◽  
Reduced Light ◽  
Open Field Condition

A field experiment was conducted at Sher-e-Bangla Agricultural University, Sher-e-Bangla, Dhaka, Bangladesh during the period from March, 2019 to June, 2019. The aim of the study was to select best summer leafy vegetables, suitable for holding under different shade condition in agroforestry systems. The selected vegetables were also grown in control i.e., open field condition or in full sunlight. The vegetables were Indian Spinach, Stem Amaranth, and Red Amaranth and treatments were T0= planting summer leafy vegetables under full sunlight, T1= planting summer leafy vegetables under 50% shade condition (reduced light intensity) and T2 = planting summer leafy vegetables under 75% shade condition (reduced light intensity). The experiment was laid out following single factor RCBD design. Three replications were used for each treatment for each crop. During the study period maximum light intensity reduction was recorded in Red Amaranth (48.28%) in 75% shade condition and minimum light intensity was reduced in case of Indian Spinach (26.14%) under 50% shade condition. The reduced light intensity had substantial effects on various growth parameters of the summer leafy vegetables. From the experiment, significant result was observed in all morphological characteristics for all leafy vegetables under reduced light intensity. Apart from this, highest yield was found in Stem Amaranth (22.33 ton/ha) and Indian Spinach (13.83 ton/ha) in 75% shade condition. Highest yield of Indian Spinach (19.40 ton/ha), Stem Amaranth (27.25 ton/ha) and Red Amaranth (11.30 ton/ha) was recorded under full sunlight. Considering shade condition, Stem Amaranth and Indian Spinach were best suitable for growing in Agroforestry systems.

Influence of Light on Fruit Set of French Hybrid Grapes

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 510f-511 ◽  
Author(s):  
D.C. Ferree ◽  
S.J. McArtney ◽  
D.M. Scurlock
Keyword(s):  
Light Intensity ◽  
Linear Relationship ◽  
Fruit Set ◽  
Light Level ◽  
Fruit Color ◽  
Soluble Solids ◽  
Hue Angle ◽  
Reduced Light ◽  
Negative Linear Relationship ◽  
Grape Cultivars

Four French–American hybrid grape cultivars grown in a greenhouse were subjected to 5 days of 80% shade at four different times around bloom. Fruit set of `Seyval' was reduced by shade imposed before, during, or immediately after bloom. `Vidal' and `Chambourcin' were less sensitive, with fruit set reduced only by shade at bloom. Shade had little effect on fruit set of `DeChaunac'. In a second study, `Chambourcin' vines were exposed to ambient, ambient plus supplemental lights, and 30%, 50%, or 80% shade for 5 weeks beginning just prior to bloom. Fruit set was positively related to light intensity. At harvest, soluble solids, pH, and hue angle had a negative linear relationship to light level. Fruit color developed earliest and most rapidly with the reduced light treatments applied at bloom. Cluster weight was positively related to light intensity.

A laboratory study of vertical migration

1955 ◽  
Vol 144 (916) ◽  
pp. 329-354 ◽  
Keyword(s):  
Light Intensity ◽  
Vertical Migration ◽  
Time Course ◽  
Tap Water ◽  
Low Light ◽  
Overhead Light ◽  
Light Intensities ◽  
Orientation Response ◽  
Reduced Light ◽  
Characteristic Maximum

In a tank filled with a suspension of indian ink in tap water, a population of Daphnia magna will undergo a complete cycle of vertical migration when an overhead light source is cycli­cally varied in intensity. A ‘dawn rise’ to the surface at low intensity is followed by the descent of the animals to a characteristic maximum depth. The animals rise to the surface again as the light decreases, and finally show a typical midnight sinking. The light intensities at the level of the animals in this experiment are of the same order as those which have been reported in field observations; the time course of the movement also repeats the natural conditions in the field. The process is independent of the duration of the cycle and is related only to the variation in overhead light intensity. At low light intensity the movement of the animal is determined solely by positive photo-kinesis; the dawn rise is a manifestation of this, and is independent of the direction of the light. At high light intensities there is an orientation response which is superimposed upon an alternating positive (photokinetic) phase and a negative phase during which movement is inhibited. The fully oriented animal shows a special type of positive and negative phototaxis, moving towards the light at reduced light intensities and away from it when the light intensity is increased. In this condition it follows a zone of optimum light intensity with some exactness. Experiments show that an animal in this fully oriented condition will respond to the slow changes of intensity characteristic of the diurnal cycle, while being little affected by tran­sient changes of considerable magnitude.

Growth of Amaranthus Hybridus (African Spinach) under diffferent Daylight Intensities in the Dry Season in Southern Nigeria

1987 ◽  
Vol 23 (2) ◽  
pp. 193-200 ◽  
Author(s):  
J. M. O. Eze
Keyword(s):  
Light Intensity ◽  
Biochemical Parameters ◽  
Dry Matter ◽  
Maximum Growth ◽  
Area Ratio ◽  
Dry Matter Accumulation ◽  
Amaranthus Hybridus ◽  
Maximum Accumulation ◽  
Southern Nigeria ◽  
Reduced Light

SummaryThe growth of Amaranthus hybridus under different daylight intensities was assessed in terms of physical, morphological and biochemical parameters. Maximum growth in many respects was achieved at about 70% of full daylight. However, full daylight favoured chlorophyll stability and maximum accumulation of total dry matter, carbohydrate, chlorophyll and ascorbic acid. The leaf area ratio increased uniformly with decrease in light intensity. Ageing was accelerated by full daylight. Reduced light intensity reduced dry matter accumulation in the roots more than in the stems or leaves.

scholarly journals Effects of the Foliar Application of Potassium Fertilizer on the Grain Protein and Dough Quality of Wheat

Agronomy ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1749
Author(s):  
Xiaoyan Gu ◽  
Yang Liu ◽  
Na Li ◽  
Yihong Liu ◽  
Deqiang Zhao ◽  
...  
Keyword(s):  
Protein Content ◽  
Foliar Application ◽  
Wheat Variety ◽  
Wheat Yield ◽  
Gluten Protein ◽  
Processing Quality ◽  
Potassium Fertilizer ◽  
Flowering Stage ◽  
Yield And Quality ◽  
Gluten Content

Potassium (K) has a significant effect on wheat yield and quality. Owing to the limitations of irrigation and production costs, soil-based applications of potassium fertilizer are not performed in wheat production on the Loess Plateau of China. In the late growth stage of wheat, potassium deficiency occurs even under sufficient nitrogen/phosphorus (N/P) levels, so it is necessary to supplement potassium through foliar spraying. However, there are few studies on the effect of the foliar application of potassium fertilizer (KFA) on wheat quality. Field experiments were conducted at two experimental sites for 2 years to study the effects of different potassium fertilizer application levels and periods on wheat yield and quality. The results showed that KFA had no significant effect on the yield of the wheat variety Xinong 20 (XN20) but increased the yield of the wheat variety Xiaoyan 22 (XY22). The improvement effect of KFA on the wet gluten content and stabilization time (ST) of XN20 was better than that on these parameters of XY22, while the sedimentation value (SV) and formation time (FT) showed the opposite trend. KFA significantly reduced the albumin content of the two varieties but had no significant effect on the globulin content. Compared with that at the other two stages, the potassium application in the form of potash fertilizer spray at a concentration of 60 mmol L−1 (K2) at the flowering stage (BBCH 65) significantly increased the protein content, wet gluten content, SV and gluten protein content in XN20 grains, whereas the application at 10 days after flowering (AA10, BBCH 71) at the K2 concentration was more beneficial to prolonging the dough FT. For XY22, the application of potassium fertilizer at the K2 concentration at the flowering stage increased the wet gluten and gluten protein levels and dough development time. There were significant genotypic differences in the composition and content of HMW-GS between the two varieties. KFA significantly increased the levels of the 1, 7 + 8, and 4 + 12 subunits in XN20 and the 1 subunit in XY22, but had no significant effect on the 2 + 12 subunit in XY22. Partial least squares path modelling (PLS-PM) analysis showed that the processing quality indexes (SV, FT, ST) and gluten protein and HMW-GS levels were regulated by the potassium fertilizer foliar spraying stage and concentration and revealed in part that KFA affected the processing quality by affecting the HMW-GS content.

Relationships Between the Distribution of Relative Canopy Light Intensity and the Peach Yield and Quality

2008 ◽  
Vol 7 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Feng-li HE ◽  
Fei WANG ◽  
Qin-ping WEI ◽  
Xiao-wei WANG ◽  
Qiang ZHANG
Keyword(s):  
Light Intensity ◽  
Yield And Quality
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