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A pot experiment was conducted in two acidic soils (pH 4.8) with similar properties except for phosphorus (P) status to investigate the influence of different P fertilizers [Kunyang phosphate rock (KPR), monocalcium phosphate (MCP)] on ryegrass growth and different soil P fractions in the two soils. The P treatments were KPR at 50, 100, and 250 mg P kg-1 and MCP at 50 mg P kg-1. Results showed that the application of P fertilizers produced significant increase of ryegrass growth compared with no P application on soil with low P status. Dry weight of ryegrass did not increase after P application, compared with no P application on soil with high P status. Through P fractionation as modified method of Hedley, Stewart, and Chauhan (1982), inorganic resin P, sodium bicarbonate (NaHCO3) P, and sodium hydroxide (NaOH) P increased after MCP treatment compared with no P application. The PR application only increased resin P and hydrochloric acid (HCl) P. Soil organic P fractions were stable and less affected by P application. The average of KPR P dissolved in the two soils across all P rates was low: only about 19% of the averaged amount of KPR P applied, which was due to its low reactivity. This explains the poor agronomic effectiveness of KPR with respect to MCP. [ABSTRACT FROM AUTHOR]

We report the release of a new, largefruited kiwifruit cultivar, 'White', selected from Actinidia eriantha. Fruit of 'White' had a mean fruit weight of 94 g, and a maximum fruit weight of 132 g at harvest in Zhejiang, China. The mean fruit weight is c. 2-4 times that of wild A. eriantha fruit found in Zhejiang and nearly 4 times that of 'Bidan', the only other registered A. eriantha cultivar. The fruit are oblong and the peelable skin is covered with dense white hair. The flesh of ripe fruit is green and has good eating quality but little juice. The soluble solids concentration was 14.7%, total sugar 9%, total acid 1.24%, and vitamin C 628.37 mg/100 g fresh weight. Its harvest season is during the last 10 days of October in the south of Zhejiang province, which is c. 2 weeks later than A. deliciosa 'Bruno' in the same area. It is sometimes referred to as the "banana kiwifruit" because the skin is easy to peel. This new cultivar has been registered in China (PVR No. CNA20050673.0). [ABSTRACT FROM AUTHOR]