Growth analysis and its importance in vegetable production.pptx

Growth analysis and its importance in vegetable production.pptx

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  09/24/2025 1 Growth analysisand its importance in vegetable production Dr. Yashpal Singh Bisht
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  Plant Growth Analysis “Growthanalysis is the procedure of analyzing plant growth rate by expressing it as the algebraic product of a series of factors.” As we have seen, new cells form continually in the apical meristems. Cells enlarge slowly in the apical meristem and more rapidly in the subapical regions. The resulting increase in cell volume can range from several fold to one hundred-fold, depending on the species and environmental conditions. Classically, plant growth has been analyzed in terms of cell number or overall size (i.e., mass). 9/3/20XX Presentation Title 2
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  (i) Leaf Area (LA) •It is the surface area of leaf, which aids in photosynthesis. • Total leaf area per plant is often a useful measurement in productivity studies. • Area can be measure by graphical methods, weight method, by using leaf area meter and by measuring length and breath of leaf. • The leaf area of standard leaf, usually 3rd leaf from top is measured and dried. a. Weight method X = Know area of leaf A = dry weight of known leaf B = dry weight of known area of all leaves. b. Linear measurement method LA = LBK L= maximum length B = Maximum breath K = constant 9/3/20XX Presentation Title 3
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  (ii) Leaf AreaIndex (LAI) • The concept was given by Watson (1947). • “LAI is defined as the leaf area per unit ground surface.” • Optimum range between 4-6. • Unit = Unitless 9/3/20XX Presentation Title 4
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  (iii) Leaf AreaRatio (LAR) • The term leaf area was suggested by Redford (1967). • “It is defined as the ratio of the leaf to the total plant biomass per plant”. Unit = Cm2 g-1 9/3/20XX Presentation Title 5
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  (iV) Specific LeafArea (SLA) • It was given by Kvet et al. (1971). • Generally, the plant grow under shade or low light condition will tends to have thinner and longer leaves. As a result, these plant posses high SLA value in comparison to normal plants Unit = cm2 /g 9/3/20XX Presentation Title 6
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  (V) Specific Leaf weight(SLW) • It was given by Pearce et al. (1968). • SLW shows the photosynthetic efficiency of crop plant. Which means higher SLW more photosynthetic efficiency of plant. Unit = g/ cm2 9/3/20XX Presentation Title 7
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  (vi) Leaf Area Duration(LAD) • “It is ability of the plant to maintain the green leaves per unit area of the land over a period of time”. • It reflects the viability of leaves and an opportunity for assimilation • It was suggested by Power et al. (1967) and modified byKvet et al. (1971). LIA1 = leaf area index at first stage LIA2 = Leaf area index at second stage T2 = time at second stage T1 = Time at first stage Unit = days 9/3/20XX Presentation Title 8
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  (Vii) Crop growth rate(CGR) • It is given by Watson 1958. • “The dry matter accumulation rate per unit land area is referred as CGR” • CGR is low in the early growth stage and increases with time, reaching a maximum value at about the time of flowering. • CGR helps in the interpretation of experimental results of different cultivars and other management practices. Where, W1 and W2 are crop dry weight at the beginning and end of the interval, tl and t2 are corresponding days, and P is the spacing occupied by the plants Unit = g/land area/day 9/3/20XX Presentation Title 9
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  (viii) Relative Growth Rate(RGR) • This concept was given by Williams in 1946. • “RGR is the slope of a curve that represents logarithmic growth over a period of time”. • An exponential growth rate is not sustainable over time. The curve typically flattens out, representing saturation in a growth at a certain point of time. Where Ln = natural log T1 = time one (in days) T2 = = time two (days) W1 = = Dry weight of plant in initial (gm) W2 = Dry weight of plant final (gm) Unit = g/g/day 9/3/20XX Presentation Title 10
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  (ix) Net Assimilation Rate (NAR) •The concept was given by Gregory (1918) and modified by Williams in 1946. • The dry matter accumulation per unit leaf area is termed as net assimilation rate (NAR)”. • The term represents net photosynthetic efficiency in the overall sense. Unit = g/cm2 /day. 9/3/20XX Presentation Title 11
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  (x) Harvest index (HI) •It is given by Nichiporovich (1965) • “Harvest index is defined as a ratio of seed yield over total dry matter production.” Economic yield =fruit yield, tuber yield etc. Biological yield= Total dry weight of whole plant including economic product 9/3/20XX Presentation Title 12
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  Click icon toadd picture Thank you 9/3/20XX Presentation Title 13