אסיף מאגר המחקר החקלאי

Drip nitrogen fertigation of 'Starking Delicious' apple trees

Year:

1989

Source of publication :

Authors :

Volume :

119

Co-Authors:

Klein, I., Institute of Horticulture, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Levin, I., Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Bar-Yosef, B., Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Assaf, R., Institute of Horticulture, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Berkovitz, A., Shaal, Golan Heights, Israel

Facilitators :

Link :

Abstract:

The response of 'Starking Delicious' (Malus domestica Borkh.) apple trees to four N fertigation treatments in drip irrigation (50, 150, 250 and 400 kg N ha-1, supplemented with a uniform dose of 400 kg K ha-1) was investigated in a field experiment during 6 years. Nitrate nitrogen in the soil was proportional (7-58 mg kg-1) to the applied N dose at the end of a 6 week fertigation period in the spring. At other times, the nitrate concentration in the soil was very low. Soil K decreased with depth and in the 0-30 cm soil layer it was negatively correlated with the applied N dose, before fertigation started. At the end of the spring fertigation period, higher K was found in all soil layers analyzed. Vegetative growth was correlated positively with the amount of N applied. Leaf chlorophyll and N were significantly lower only in the lowest N treatment, while increased fruit size and decreased fruit color were measured only in the higher N treatments. Yield was severely biennial. In the 'On' years crop load was heavier as less N was applied. An extremely high crop load in the lowest N treatment was followed by a reduced flower density and yield in the following season. In the 'Off' years, a significantly higher yield was obtained with the 150 kg ha-1 dose. The dry weights, N, P and K contents of the above ground parts of mature apple trees were determined. © 1989 Kluwer Academic Publishers.

Note:

Related Files :

Related Content

More details

You may also be interested in