穴播条件下株行距对紫花苜蓿种子产量和质量的影响

Effect of Spacing and Intra-spacing under Hole-seeding Conditions on Alfalfa Seed Yield and Quality.

在甘肃省酒泉市研究了穴播条件下不同株、行距处理对紫花苜蓿种子生产性能的影响,结果表明:在产种第一年(2004年)行距和株距对种子产量和产量构成因素均产生了显著的影响(P<0.05),随着行距从60cm递增至100cm,种子产量也随之从1240 kg/hm2下降到982 kg/hm2,而各株距处理的种子产量则从15 cm的1426 kg/hm2依次递减至60cm的807 kg/hm2;行距60cm和株距15cm组合的产量最高,为1833 kg/hm2,100cm行距和株距60cm组合的产量最低,为753 kg/hm2。株行距的增加显著降低了枝条密度,但结荚花序数/枝条和荚果数/结荚花序却显著提高。品种间种子产量的差异不显著。品种间的结荚花序数/枝条、种子重量、正常种苗率、发芽势和硬实率存在显著的差异(P<0.05)。

A study was conducted in Jiuquan, Gansu Province to determine the effects of spacing and intraspacing on alfalfa seed yield and quality, and the result in 2004（the 1st seed-producing year） showed that both of the spacing and intra-spacing affected alfalfa seed yield and yield components significantly （P〈 0.05）. With the increase of spacing and intra-spacing from 60era and 15era to 100era and 60cm, seed yields decreased form 1240 kg/hm^2 and 1426 kg/hm^2 to 982 kg/hm^2 and 807 kg/hm^2 respectively. 60cm × 15cm treatment recorded the highest yield , 1833 kg/hm^2 , and 100cm × 60cm treatment, the lowest, 753 kg/hm^2. The seed yield differences between varieties were insignificant. Racemes/stem and pods/raceme went up significantly with the increase of spacing and intra-spacing while fertile shoots per square meter dropped dramatically （P〈0. 05）. Spacing and intra-spacing did not affect seed number/pod and seed weight significantly （P〉0.05）. Significant differences were found in racemes/stem, seed weight, hard seed percentage, normal seedlings, first counts between varieties （P〈0. 05）.