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引用次数: 1
摘要
在博茨瓦纳的Impala研究站进行了田间试验,目的是调查胡萝卜(Daucus carota L.)疏苗的关键时期。试验采用完全随机区组设计(CRBD),重复3次,不同播期重复4次。在所有地块以相同的播种速率(3 kg hm -1)播种,以获得初始阶段相等的植株数量,然后在不同时间(出苗后第2、3、4、5和6周)疏播至行间30 cm和行内5 cm,以保持整个试验期间的恒定种群数量。在所有播种期,从播种到收获的成熟期都是恒定的。随着间伐时间的推迟,株高和产量显著下降。叶片发育数、根径和根长不受间伐时间的影响。营养生长和产量随晚播试验而下降。由此可见,间伐时间显著提高了株高和产量,特别是在早期,胡萝卜产量在季节早期播种时最好。
The Critical Period for Thinning Carrot (Daucus carota L.)
Field experiment was carried out at Impala Research station, in Botswana, aiming at investigating critical period for thinning of carrot (Daucus carota L.). The experiment was laid out in a complete randomized block design (CRBD), replicated three times and was repeated four times at different sowing dates. Seeds were sown at the same rate (3 kg ha-1) in all plots to obtain an equal plant population at initial stage, thereafter thinned at different times (2nd, 3rd, 4th, 5th and 6th weeks after emergence) to 30 cm between rows and 5 cm between intra rows to maintain constant population across the experiment. Days to maturity were constant from sowing to harvest in all the sowing dates. Plant height and yield significantly declined as thinning time was delayed. Number of leaves developed, root diameter and root length were not influenced by the thinning time. Vegetative growth and yield declined with the late sown experiments. It can be concluded that thinning time significantly increase plant height and yield, especially at earlier stages and carrot yield best when sown earlier in the season.