SUBSTRATE WATER CONTENT AND NITROGEN INTERACTIONS IN GROWING MEDIA: YIELD, FRUIT QUALITY, WATER CONSUMPTION AND WATER USE EFFICIENCY ON TOMATO
Substrates water content × N rate experiments were conducted using a D-saturation design in media pot planting tomato (Solanum lycopersicum L.) during September 2006 to February 2007 in Beijing. A range of substrate water content and N rates were selected to permit the calculation of appropriate water × N production functions. The results indicated that under the same nitrogen level, tomato yield increased significantly with the water amount applied, T2 and T7 was 108.12%, 214.96% higher than T1 and T3 respectively. However, under the same water level, tomato yield decreased with N rate, T3 was 42.51% lower than T1, and T7 was 12.99% lower than T2. Water consumption increased significantly with water applied under the same N rate, and decreased with N rate under the same water level but not significant, T3 and T7 was 33.12%, 20.29% less than T1 and T2 respectively. There was a positive effect by interaction between water and nitrogen on water use efficiency but not significant. Fruit vitamin C, sugar, acids, nitrate, and TSS contents were decreased with water and increased with N rate. An over-irrigation with under-N treatment or under-irrigation with over-N treatment in tomato will produce a low soluble solids content but high crop yield and poor crop yield but high soluble solids content respectively. Our results recommend that the optimum levels of water and nitrogen for the high yield, good quality under the study condition were the substrates water content of 90%, and pure nitrogen rate of 0.58-0.74 g/pot/time.
Xiao, Z., Jiang, W., Yu, H., Wang, M. and Li, P. (2009). SUBSTRATE WATER CONTENT AND NITROGEN INTERACTIONS IN GROWING MEDIA: YIELD, FRUIT QUALITY, WATER CONSUMPTION AND WATER USE EFFICIENCY ON TOMATO . Acta Hortic. 843, 57-64
Solanum lycopersicum L., water and nitrogen interactions, yield, fruit quality and water use efficiency