บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Management of irrigation during the post harvest stage of a cultivar of an early ripening table grape.

Nuzzo, V.; Dichio, B.;

Irrigazione e Drenaggio Year: 2000 Vol: 47 Issue: 4 Pages: 43-46 Ref: 7 ref.

2000

บทคัดย่อ

Management of irrigation during the post harvest stage of a cultivar of an early ripening table grape.

The preliminary results of a study on the effects of water availability on a Superior Seedless vineyard during the postharvest period are presented. The vineyard water consumption was calculated using the Hargreaves equation multiplied by an appropriate crop coefficient. Shoot leaf area evolution was determined by destructive sampling. The number of stem and lateral leaves, the leaf area of stem and lateral leaves, and the stem and lateral length were determined. Leaf water potential and soil humidity were also determined. At pruning, the number of shoots per vine, their length and weight were measured separately on main and lateral stem. The preharvest irrigation scheduling was set to compensate for evapotranspiration as measured by the evapotranspiration coefficient (ETc) on a weekly basis. During the postharvest phase, irrigation scheduling based on a control (irrigation scheduling criteria as set for pre-harvest conditions) or 30% irrigation (30% of the water lost by evapotranspiration durin

g a period when 70% of available water had been used up in the first 60 cm of soil) was used. Results based on one year of testing showed that a moderate water stress imposed during the postharvest phase produced a saving of 132 mm of irrigation water at farm scale, a smaller development in the leaf area on the lateral stems and a greater length of strongly lignified main stem. This is particularly important for this cultivar as it is characterized by basal bud sterility and requires good growth in the main stem in order to guarantee high productivity.