ISHS Acta Horticulturae 984: VII International Symposium on Mineral Nutrition of Fruit Crops
NUTRIENT UPTAKE AND DISTRIBUTION IN FIELD-GROWN KIWIFRUIT VINES |
| Authors: | Z. Zhao, Y. Tong, J. Wang |
| Keywords: | kiwifruit, nitrogen, phosphorus, potassium, absorption, utilization, accumulation |
| DOI: | 10.17660/ActaHortic.2013.984.24 |
| Abstract:
Mineral nutrients like nitrogen (N), phosphorus (P), potassium (K) are important components of kiwifruit vines, needed for increasing yields and improving fruit quality for human health; they are also essential to the functioning of the ecosystem, and may cause pollution if dispersed in the environment. Ten-year-old Qin Mei (Actinidia deliciosa ‘Qinmei’) kiwifruit trees were used as experiment materials. Three trees were selected for each of the six samplings along the season. Sampling began on March 28 (sprouting and foliage growing) and then they were carried out on May 18 (young fruit), July 9 (fruit expansion), September 8 (fruit maturity), November 6 (defoliation) and January 11 (dormancy). Samples of fruits, leaves, shoots, branches, trunks, and roots were collected separately each time. The roots distribution, and biomass, element content and accumulation in different organs in different periods were studied. The results showed that N, P and K accumulated in fall were used to meet demand during the growth resumption in spring the following year. For a fruit production of 40.2 t/ha 217 kg/ha N, 37 kg/ha P and 168 kg/ha K, were yearly absorbed. NPK distribution within kiwifruit vines during harvesting period were 52%, 48% and 62% in fruits, 19%, 17% and 23% in leaves, 22%, 19% and 12% in stem and 7%, 16% and 3% in roots, respectively. Nutrient removals in each ton of fruits were 5.39 kg N, 0.92 kg P and 4.18 kg K. | |
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