Growth and Canopy Characteristics of Field-Grown Tomato
2000
Scholberg, Johannes | McNeal, Brian L. | Jones, James W. | Boote, Kenneth J. | Stanley, Craig D. | Obreza, Thomas A.
Although detailed growth studies and yield analysis are common for agronomic crops, their application to horticultural crops is limited. Detailed growth measurements of field-grown tomato (Lycopersicon esculentum Mill.) were conducted at four Florida locations for two irrigation methods. Maximum rate of main-stem node development was ≈0.5 nodes d⁻¹ and leaf area index (LAI) increased exponentially with main-stem node number. Maximum LAI was attained 11 wk after transplanting, with values ranging from 1.5 to 3.0 and from 3.2 to 6.0 for drip-irrigated and subirrigated crops, respectively. Lower LAI values with drip irrigation were only partially related to wider row spacings. Final biomass (dry weight) ranged from 6 to 12 Mg ha⁻¹ and fruit dry weight harvest indices (fruit biomass/total above-ground biomass) ranged from 0.53 to 0.71. Average dry matter accumulation by roots, stems, and leaves accounted for ≈3, 23, and 17% of final biomass, respectively. Estimated radiation use efficiency (RUE) for tomato averaged 1.05 g dry weight MJ⁻¹ m⁻², with 50 to 60% light interception in the crop production area at LAI values of 4 to 5. At 11000 plants per ha, the rate of dry matter accumulation averaged 17.8 g d⁻¹ m⁻² during the linear growth phase, with instantaneous dry matter partitioning to fruits averaging 0.70 during the fruit-growth phase. Relationships between degree days, estimated cumulative intercepted radiation, and fruit yield accounted for much of the variation in fruit yields for these different seasons and locations throughout Florida.
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