Author(s):

Nidhi Sharma, Suneel Sharma and Ram Niwas

Abstract:
The experiment was conducted at Citrus orchard, Department of Horticulture, Chaudhary Charan singh Haryana Agricultural University Hisar. Fully grown twelve year old trees properly maintained of uniform size and vigour, free from disease and pest, of three Citrus groups with two cultivars in each were used in study. Spring flush was taken in all the six varieties of three groups; Sweet orange Mandarin hybrids and Grapefruit. All citrus species and their respective cultivars behaved different from each other in the same environments. The bud break was observed earliest in sweet orange that took after 13 days of during 2014 and. latest during 2015 after 14 and 10 days of buds initiation (Jaffa and Pine apple) as compared to other citrus species. The floral development between sweet orange cultivars was faster in Pine apple as compared to Jaffa. Flowering end was later during 2014 in all the citrus cultivars bercause of low temperatures prevailed during February, 2014 as compared to February 2015. The slope of linear regression line between rate of floral development and heat units accumulated indicates that rate of floral development per unit degree day was -0.002 in citrus cultivars.

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