Table 2 Thermal indices of experimental sites.

From: Climate variables effect on fruiting pattern of Kinnow mandarin (Citrus nobilis Lour × C. deliciosa Tenora) grown at different agro-climatic regions

 

Thermal indices of three experimental sites

Sargodha

T.T Singh

Vehari

2017

2018

2017

2018

2017

2018

GDDs (°C day)

4014.9

3929.1

4289.9

4255.7

4792.0

5076.5

CHU (°C day)

6249.0

6169.0

6391.5

6437.4

7117.1

7316.4

mCHU (°C day)

6996.0

6862.1

7269.0

7270.1

7992.7

8170.3

HYTUs (°C day %)

250,786

248,275

266,322

262,059

249,051

233,308

PTI (°C)

13.89

13.79

14.64

14.73

16.03

17.09

PTU (°C day hours)

10,641,199

10,125,201

11,878,037

11,731,858

14,020,769

14,792,109

HTU (°C day hours)

8,521,921

7,896,448

8,344,101

8,287,976

10,216,209

11,432,481

p Heat unit (°C day)

4940.275

4818.85

5282.25

5223.875

5734.5

5965.75

n Heat unit (°C day)

3186.925

3113.225

3360.35

3355.7

3866

4208.75

Period (Fruit-set to maturity)

292 days (18/03 to 31/12)

297 days (23/03 to 31/12)

288 days (14/03 to 31/12)

292 days (18/03 to 31/12)

282 days (08/03 to 31/12)

284 days (10/03 to31/12)

  1. GDDs (growing degree days), CHU (citrus heat unit), mCHU (modified citrus heat unit), HYTUs (hydrothermal units), PTI (photothermal index), PTU (photo thermal unit), HTU (helio thermal unit), p (photo period), n (nytco period).