Recovery of common agricultural weeds after burial by soil was studied in four greenhouse and three field experiments. Species studied included velvetleaf, Powell amaranth, common lambsquarters, barnyardgrass, and giant foxtail. Seedlings were bent over before burial to simulate the effect of the impact of soil thrown by a cultivator. Altogether, more than 35,000 seedlings were marked and obser...

A balanced two-factor ANOVA yields a highly significant effect of watering treatment (F = 10.55, df = 1, 24, P = 0.003) and nonsignificant effects of source (F = 0.47, df = 2, 24, P = 0.628) and the watering treatment x source interaction (F = 0.05, df = 2, 24, P = 0.955). There is one low outlier, and one of the treatment groups (Heeia fresh) had substantially less variation than the others, b...

Optimum irrigation is very important for nursery stock management of F1-hybrid oil palm (Elaeis guineensis Jacq.), constituting a major production cost. Generally, over watering of nursery stock can be a cause of loss of productivity. The aim of this study was to investigate the physiological and biochemical responses of oil palm nursery stock to reduced soil water content (SWC) and during the ...