EFFECTS OF CULTIVATION PATTERNS ON LEAF SENESCENCE AND YIELD OF SPRING MAIZE DURING FLOWERING MILKING STAGES
To discuss the physiological mechanisms and countermeasures related to anti - senescence, productivity and efficiency enhancements , we tested leaf senescence of spring maize during flowering and milking periods in four cultivation patterns, e. G. , the farmer (F) mode, the high productivity and hihg efficiency (HH) mode, the superior high productivity (SH) mode, and the superior high productivity and efficiency (SHH) mode. The result shows that: In this period, dynamics of leaf area index (LAI) , photosynthesis ( Pn) , and activity of protective enzyme system in maize under HH, SH and SHH modes presented sigle peaked curves. Pn and the activity of protective enzymes in leaf were the highest at 14 days after pollination, while malondialdehyde (MDA) Content continued increasing. Compared with SH, HH and F modes, SHH mode improved the activities of protective enzymes, slowed down the declining of protective enzymes'activity and alleviated the accumulation of MDA. During the flowering and milking stages, the lower leaves on spring maize senescenced earlier than the upper leaves, while the ear leaves showed aging at the latest. SHH mode effectively delays leaf senescence, improves the nitrogen use efficiency during the flowering and milking stages, as is the physiological basis for the high yield and high efficiency production of spring maize.
Spring maizeCultivating modelProtective enzymesLeaf senescence
NETL
NSTL
万方数据
维普
