Growth of sugar beet crops in Canterbury

Abstract

The growth of 8 semi-commercial crops of sugar beet on the Canterbury Plains was monitored during the 1981-82 season. Sugar yields ranged from 9 to 15 tlha. The highest yielding crop intercepted 1166 Ml/m 2 of photosynthetically active radiation. The major !"eason for yields of less than 15 tlha was reduced radiation interception (up to 37070) because of small leaf areas. This was probably caused by drought in most crops, but shortage of nitrogen, variable plant populations, weeds, and virus attack were also implicated at some sites. The efficiency of converting intercepted radiation to dry matter averaged 2.3 in 6 crops, but was about 2.0 in the other 2 crops (one affected by drought, the other by virus). Harvest index in most crops averaged 0.57, but was slightly lower in crops grown on the more fertile soils. Sugar yields were generally unaffected by soil type, but tops were heavier on the deeper soils. As the autumn progressed, top yields on the deep soils decreased and contained a higher proportion of crowns.

Photosynthetic activity and productivity of middle-early soft spring wheat of KASIB seed field in the conditions of the southern forest - steppe of Western Siberia

“…Скорость фотосинтеза предопределяет уровень формирования урожая. В этой связи стимулирование процесса фотосинтеза растений служит реальной основой в решении проблемы повышения урожайности культур [9,10]. Одним из важнейших слагаемых в формировании урожая, наряду с другими показателями, является чистая продуктивность фотосинтеза.…”