施用硝酸钾对草地早熟禾生长及草坪外观质量的影响

Effect of KNO_3 on Poa pratensis Growth and Turf Quality

为确定草地早熟禾草坪KNO3最佳的施用量,设计了B1(ck,不施用肥料),B2(11.65 g/m2),B3(13.82g/m2),B4(16.13 g/m2)等4个处理,试验采用小区进行,每个处理3次重复。结果表明:草坪植株高度随着施肥量增加而增加,B4处理显著高于B1(ck);除8月份外,B4处理的叶片宽度均显著高于B1(ck),B3处理的叶片宽度仅在7月份显著高于B1(ck),B2处理与B1(ck)间无显著差异;草坪总叶绿素的质量分数B3,B4处理均显著高于B1(ck),B2处理与B1(ck)之间无显著差异;B4处理的干物质积累量显著高于B3处理和B1(ck),B3处理显著高于B1(ck);除7月份之外,B4处理的叶片长度均显著高于B1(ck),B3处理的仅在9月份显著高于B1(ck),B2处理与对照之间无显著差异;B4处理的外观质量得分最高,高于B1(ck)1.47分。综合分析表明,KNO3施用量以16.13 g/m2为最佳。

In order to determine the best applying content of KNO3 in Poa pratensis,we designed 4 treatments： B1（ ck no fertilizer）,B2（ 11. 65 g / m2）,B3（ 13. 82 g /m2）,B4（ 16. 13 g /m2）. The experiment was carried out in three communities,each repeated for three times. The results showed that the landscape lawn plant height increased with fertilizer amount,the B4 treatment was significantly higher than B1. Except August,the width of leaves of B4 treatment were significantly higher than that of B1,B3 treatment significantly higher than B1 only in July,B2 treatment was no significant difference with B1. The total chlorophyll of B3 and B4 treatment was significantly higher than B1,B2 treatment was no significant difference with B1. Dry matter accumulation of B4 treatment was significantly higher than B1 and B3 treatment,and B3 treatment was significantly higher than B1. The leaf length of B4 treatment was significantly higher than B1 except July,and B3 treatment was significantly higher than B1 only in September,B2 treatment was no significant difference with B1. The appearance B4 treatment was the best and score was 1. 47 higher than B1. Comprehensive analysis showed that the best amount of KNO3 was 16. 13 g / m2.