Leaf analysis as a guide to the nutrition of fruit crops IX. Effects of initial and supplementary levels of N and P on black currants (ribes nigrum L.) grown in sand culture

✍ Scribed by C. Bould; R. I. Parfitt

• Publisher: John Wiley and Sons
• Year: 1972
• Tongue: English
• Weight: 485 KB
• Volume: 23
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2740230807

✦ Synopsis

Abstract

A study was made, by means of a factorial sand culture experiment, of the main effects and interactions of varying initial levels of N and P and of supplementary levels of N and P applied in July, on shoot growth, blossom number, fruit set, berry weight and crop yield of black currants grown as biennials and of their relationships with leaf‐lamina nutrient concentrations. Nitrogen influenced crop yield largely through its effect on blossom number, whereas phosphorus influenced crop yield through increased shoot growth and percentage fruit set. Crop response to N was approximately linear (at adequate P levels) over the leaf‐N range 2.1 to 2.5% of N in dry matter, whereas crop response to P (at adequate N levels) was curvilinear over the leaf‐P range 0.1 to 0.3% of P in the dry matter of samples taken in August of the previous season. Additional‐N applied in July increased yield but was strongly dependent on level of initial‐P. Additional‐P increased yields at the two lower levels of initial‐P only.