EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

The heat balance of apple buds and blossoms part i. heat transfer in the outdoor environment



The heat balance of apple buds and blossoms part i. heat transfer in the outdoor environment



Agricultural and Forest Meteorology 35(1): 339-352



The effect of temperature during the period of bud growth on final yield of apples and possible methods of modifying bud temperature are discussed. These methods utilise either the latent heat of fusion of ice to raise bud temperature above a critical sub-zero temperature or the latent heat of vaporisation of water to lower bud temperature during the day. If the rates of heat transfer between the bud and its environment can be estimated, the rates of water application for the latent heat effects can be determined. The relative values in the heat balance equation are examined. During the day, the net radiation of the bud is complex, but at night the heat balance equation can be solved (in the absence of moisture) and the heat transfer coefficient, hc, estimated at different stages of apple bud development. The bud is treated as a sphere and the heat transfer coefficient, h'c, is estimated from bud dimensions and heat transfer theory for laminar flow. It is shown that the heat balance method of determing hc is satisfactory for the stages of development from 'dormancy' to 'green cluster'. The ratio of hc/h'c varied from 1.2 for dormant buds to 2.1 at 'green cluster'.

(PDF emailed within 0-6 h: $19.90)

Accession: 006686174

Download citation: RISBibTeXText

DOI: 10.1016/0168-1923(85)90094-2



Related references

The heat balance of apple buds and blossoms. I. Heat transfer in the outdoor environment. Agricultural and forest meteorology 35(35): 339-352, 1985

The heat balance of apple buds and blossoms part iii. the water requirements for evaporative cooling by overhead sprinkler irrigation. Agricultural and Forest Meteorology 37(2): 175-188, 1986

The heat balance of apple buds and blossoms part ii. the water requirements for frost protection by overhead sprinkler irrigation. Agricultural and Forest Meteorology 37(2): 159-174, 1986

The heat balance of apple buds and blossoms. III. The water requirements for evaporative cooling by overhead sprinkler irrigation. Agricultural and forest meteorology 37(2): 175-188, 1986

The heat balance of apple buds and blossoms. II. The water requirements for frost protection by overhead sprinkler irrigation. Agricultural and forest meteorology 37(2): 159-174, 1986

A heat transfer model for ice encapsulated apple buds. Paper, American Society of Agricultural Engineers (82-4008): 24 pp, 1982

Prediction of sprinkler off-times during frost protection of apple buds: a heat transfer model. Transactions of the ASAE American Society of Agricultural Engineers 26(5): 1430-1434, 1983

Measurements of the heat balance under plastic mulches. Part 1. Radiation balance and soil heat flux. Agricultural and Forest Meteorology 36(3): 227-239, 1986

Measurements of sap flow in the roots, trunk and shoots of an apple tree using heat pulse and heat balance methods. Journal of Agricultural Meteorology 53(2): 141-145, 1997

Heat transfer from impinging slot jets of air. Part 2: Average and local heat transfer coefficients. Wood Science and Technology 13(1): 1-20, 1979

Contribution of heat transfer to turbine blades and vanes for high temperature industrial gas turbines. Part 2: Heat transfer on serpentine flow passage. Annals of the New York Academy of Sciences 934: 473-480, 2001

Heat and mass transfer in stored milo. Part I. Heat transfer model. Transactions of the ASAE 35(5): 1569-1573, 1992

The heat balance in a potato pile part 1 the influence of the latent heat of the removed water. Acta Agriculturae Scandinavica 25(2): 81-87, 1975

Heat transfer and temperature distribution in a cabin with wooden wall construction. Part I. Theoretical considerations on heat transfer and fire risk. Part II. Temperature distribution and air flow. Holz als Roh und Werkstoff 32(1; 2): 24-29; 64-71, 1974

Determination of moisture, heat and salt transfer by water-heat balance method as applied to calculating irrigation and drainage regimes in various natural and climatic conditions. ICID Bulletin 32(1): 13-25, 1983