INFLUENCE OF POPULATION ON WHITE LUPIN MORPHOLOGY AND YIELD
The influence of plant population on sweet white lupin (Lupinus albus L. ’Ultra’) growth and production were investigated during 1985 and 1987. In 1985, white lupin was sown at populations of 11, 20, 44 and 178 plants m−2, and in 1987 populations of 20, 44, and 100 plants m−2. Plant density had a significant influence on seed and total plant yields and yield components. Seed yields ranged between 2182 and 3708 kg ha−1, and total plant forage yields (at maximum LAI) ranged between 2044 and 11 501 kg ha−1 at populations of 11 to 178 plants m−2. Main-stem and lateral pods, seed pod−1, potential fruiting sites and lateral branch number were inversely proportional to plant density. Lateral pod production was more sensitive to population pressure than main-stem pod production. The number of lateral pods plant−1 was a linear function, whereas the number of main-stem pods plant−1 was a curvilinear function of the inverse of plant population.Key words: Lupinus albus, L. ’Ultra’, physiologic maturity, flower and fruit potential, lupin