estimation of crop water requirment ofdifferent crops grown in kumlur n.
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ESTIMATION OF CROP WATER REQUIRMENT OFDIFFERENT CROPS GROWN IN KUMLUR

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ESTIMATION OF CROP WATER REQUIRMENT OFDIFFERENT CROPS GROWN IN KUMLUR. By, NISHIT AMAN BTE-06-022. GREEN GRAM. Season – Rabi ( Starting Nov) Kharif ( Starting March) Temperature – 30- 35 degree Celsius Soil Type - Loamy soil.

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green gram
GREEN GRAM
  • Season – Rabi ( Starting Nov)

Kharif ( Starting March)

  • Temperature – 30- 35 degree Celsius
  • Soil Type - Loamy soil
how to calculate cwr
HOW TO CALCULATE CWR?
  • Calculate reference Evapotranspiration
  • Find out crop coefficient of the green gram during different stages of growth.
  • Multiply both to get actual evapotranspiration.
data collected for calculation
DATA COLLECTED FOR CALCULATION
  • Date of sowing – 1st march
  • Date of harvest – 8th June
  • Altitude of Kumulur – 78 m
  • Latitude of Kumulur - 10°8’
  • Relative humidity – 80%
  • Mean Max. temperature during March, April May and June are 32.4°C,36.3°C 38.0°C and37°C
  • Mean Min. temperature during March, April May and June are 22.4°C, 24.7°C, 26.6°C, and 26.1°C
estimation of et 0
ESTIMATION OF ET0
  • Modified Penman method
  • Mean max. temperature for four month is 35.57°C.
  • Mean min. temperature for the four month is 24.95°C.
  • Mean air temperature will be 30.26
  • Mean sunshine Hour (n) 3.43
  • Maximum Possible Sunshine hour 12.3
  • n/N will be 0.28
slide6
Cont..
  • Extra-terrestrial radiation(Ra) in mm/day 12.74 (from the table).
  • Wind speed = 6km/hr or 144km/day
aerodynamics term
AERODYNAMICS TERM
  • ea = 42.41 mbr ( From the table)
  • ed = RH/100 × ea

= .0.80 ×42.41

= 33.92mbr

  • ea – ed = (42.41 - 33.92) mbr

= 8.49mbr

  • f(u) = 0.66
  • ( 1- W) = 0.2184 ( from the table)
radiation term
RADIATION TERM
  • Rns = Ra× 0.292

= 12.74 ×0.292

= 3.72

  • Rnl = f(t) × f(e) × f(n/N)

= 16.75 ×0.1 ×0.354

= 0.59

  • Rn = Rns – Rnl

= 3.72 - 0.59

= 3.13

slide9
Cont…
  • W = 0.781
  • ET0 (Unadjusted) = W Rn + (1-W).f(u)(ea - ed )

= (0.781 × 3.13) +

0.2184 ×0.66 ×8.49

= 3.66mm/day

  • ET0 = c × ET0

= 1.09 × 3.66

= 3.99 mm/day

determination of crop cofficient
DETERMINATION OF CROP COFFICIENT
  • Initial Stage - 20days
  • Development stage – 30 days
  • Middle stage – 30 days
  • Late stage – 20days
initial stage
Initial Stage
  • From 1st march to 20 march
  • Kc = 0.5
  • ET0 = 3.99mm/day
  • ET = Kc ×ET0

= 0.5 × 3.99

= 1.995mm/day

= 39.9mm/stage

development stage
Development stage
  • From21st march to 20th April
  • Kc = 1.05
  • ET0 = 3.99mm/day
  • ET = Kc ×ET0

= 1.05 × 3.99

= 4.1895 mm/day

= 125.685 mm/Stage

middle stage
Middle stage
  • From20st April to 19th May
  • Kc = 1.02
  • ET0 = 3.99mm/day
  • ET = Kc ×ET0

= 1.02 × 3.99

= 4.151 mm/day

= 124.53 mm/Stage

late stage
LATE STAGE
  • From20st MAY to 10th May
  • Kc = 0.9
  • ET0 = 3.99mm/day
  • ET = Kc ×ET0

= 0.9 × 3.99

= 3.591 mm/day

= 71.82 mm/Stage

slide15
Cont…
  • Total water requirement from day of sowing to day of harvesting will be summation of all.
  • 39.9mm+125.685 mm +124.53 mm + 71.82 mm

= 361.935mm

result
Result
  • Total water requirement of the green gram as calculated by Modified penmen method is 361.93mm.