论文部分内容阅读
通过对籽粒苋根系生长与抗旱性的观察表明:1,籽粒苋一生中,根系的生长呈“先快、后慢、更快、再慢”的变化趋势,这种变化趋势与不同时期籽粒苋自身的营养状况及根系当时所伸达土层的土壤紧实度有关。2,籽粒苋根系很长,成熟时主根的入土深度可达2.45米,而且侧根多、根系发达。单株一级侧根数可达约510条。庞大的根系特点,与其较强的抗旱性密切相关。3,从不同生育阶段根系与地上部的生长变化规律看:在3、4真叶期以前,籽粒苋以根系生长为主,地上部生长缓慢。以后随着生长期的推移,逐渐过渡到以地上部生长为主。4,籽粒苋抗旱性很强,当接近收获,土壤水分0～50cm降至10％以下时,整个田间生长基本正常,可获得较好产量,
Through the observation of root growth and drought resistance of grain amaranth, the results showed that: 1, the growth of root system during the lifetime of grain amaranth showed the trend of “fast first, slow last, faster then slower”. This trend was in line with the change of grain amaranth Their nutritional status is related to the soil compaction of the soil that the roots reach at that time. 2, grain amaranth root is very long, the root of mature root depth of up to 2.45 meters, and more lateral roots, developed roots. The number of primary roots per plant can reach about 510. Large root characteristics, and its strong drought resistance are closely related. The growth and variation of roots and shoots at different stages of growth showed that before the true leaf stage of 3, 4, the main growth of grain amaranth was root growth and the shoot growth was slow. With the passage of growth later, gradual transition to the growth of the ground-based. 4, grain amaranth drought resistance is very strong, when close to harvest, soil moisture 0 ~ 50cm below 10%, the growth of the entire field was normal, get better yield,