eCite Digital Repository

The effects of temperature, vapour pressure deficit and soil moisture stress on growth, flowering and fruit set of custard apple (Annona cherimola x Annona squamosa) 'African Pride'

Citation

George, AP and Nissen, RJ, The effects of temperature, vapour pressure deficit and soil moisture stress on growth, flowering and fruit set of custard apple (Annona cherimola x Annona squamosa) 'African Pride', Scientia Horticulturae, 34, (3-4) pp. 183-191. ISSN 0304-4238 (1988) [Refereed Article]

Copyright Statement

Copyright 1988 Elsevier Science Publishers B.V.

DOI: doi:10.1016/0304-4238(88)90091-X

Abstract

The effects of temperature, vapour pressure deficit (VPD) and soil moisture stress on growth, flowering and fruit set of custard apple (Annona cherimola x Annona squamosa) cultivar 'African Pride' were evaluated under controlled-environment conditions. Flowering and fruit set were affected not only by the environmental conditions during flowering, but also by vegetative flushing of the tree. Flowering was closely associated with vegetative flushing. The level of natural fruit set under controlled-environment conditions, irrespective of temperature or humidity, was low (<3.1%) compared to field or container-grown trees flowering under ambient conditions (11 and 28%, respectively). The increased set under ambient conditions appears to be due to the presence of insect pollinators, in particular Nitidulid beetles which were observed in the flowers. High VPD (1.2 kPa) severely reduced both flowering and fruit set. Soil moisture stress (mid-day leaf water potential -2.0 MPa) also reduced flowering and fruit set, particularly at high temperature (28C). Hand-pollination of flowers, even under high VPD conditions, resulted in a significantly higher set (>20%). Productivity of custard apple in the field may be improved by cultural techniques such as overhead misting, windbreaks and efficient irrigation scheduling.

Item Details

Item Type:Refereed Article
Keywords:custard apple, hand pollination, moisture stress, vapour pressure deficit
Research Division:Agricultural and Veterinary Sciences
Research Group:Horticultural Production
Research Field:Horticultural Crop Growth and Development
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Horticultural Crops not elsewhere classified
Author:Nissen, RJ (Mr Robert Nissen)
ID Code:112195
Year Published:1988
Web of Science® Times Cited:21
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2016-10-30
Last Modified:2017-05-01
Downloads:0

Repository Staff Only: item control page