I. Growth analysis ofLupinus angustifoliuscv. ‘WAU11B’

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Abstract
Responses to trickle irrigation during flowering were studied in a spring sowing of L. anguistifolius at 3 densities. Non-irrigated plants reached maximum leaf wt 2 wk earlier than irrigated plants, and plants at high density (156 plants/m2) had a peak leaf wt 6 wk earlier than low-density plants (27 plants/m2). Maximum aboveground herbage from non-irrigated plots was 1200 g/m2, 116 days after sowing, and in irrigated plots 2000 g/m2 by 130 days. Herbage from low-density plants was of better nutrient quality, containing more leaf when dry wt was maximal. All non-irrigated plots had similar seed yield averaging 552 g/m2. In low-density irrigated plots the yield was 733 g/m2. Low-density plants had higher relative growth rates and net assimilation rates, but leaf area ratios were similar to those of high density plants. Relative growth rates and leaf area ratios in irrigated plants were higher than in non-irrigated plants, but net assimilation rate was lower. Leaf area index was greater and was reached later in irrigated plots. Low-density irrigated plants had greater leaf area durations than high-density non-irrigated plants. Flowering began 60 days after sowing and was prolonged by irrigation which caused the production of upper branch inflorescences. Seed wt increase was more rapid in non-irrigated plants, with seeds reaching greater mean wt. In all treatments almost concurrent filling occurred in mainstem and branch seeds.