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本文探讨二年生白花草木樨做为夏闲绿肥和春闲绿肥的培肥机理和增产效应。现已取得的资料表明,夏闲草木樨绿肥到8月20日为止的翻压期,可提供绿肥总量7643.8斤/亩,积累氮素46.3斤/亩,春闲草木樨绿肥到5月11日为止的翻压期,可提供绿肥总量6685.0斤/亩,积累氮素34.2斤/亩。绿肥翻压以后,土壤有机质和氮、磷全量都趋于增加,物理性质趋于改善,而最突出的变化,是水解氮的显著增加,在夏闲绿肥第一季后作生长期间,水解态氮超过对照22.4PPm,在春闲绿肥第一后作生长期间,水解态氮超过对照41PPm,而且这种高水解氮趋势可持续二季到三季后作期,草木樨绿肥培肥和增产的主要依据是这种水解态氮的显著和稳定的增加。有效磷含量在绿肥生长期和翻压之初低于无绿肥区,尔后随着绿肥中有机态磷的逐步分解释放,有效磷含量才逐步升高,因此种植绿肥常需配合施磷。夏闲草木樨绿肥第一季后作平均增产196.9斤/亩,第二季后作增产99.2斤/亩,第三季后作增产144.4斤/亩,三季共增产粮食440.05斤/亩,比对照三季累计产量增长31.4%。第四季后作增产效应消失。春闲草木樨绿肥第一季后作平均增产110.9斤/亩,比对照增长11.5%。夏闲草木樨绿肥每千斤绿肥增产粮食的平均数值,在第一季后作是24.2斤,第二季是12.3斤,第三季是18.3斤,三季总和,共增产粮食54.8斤。每千斤春闲草木樨绿肥在第一季后作平均增产16.3斤。
In this paper, perennial Pak Hom, as a summer green manure and spring green manure fertilizer mechanism and yield effects. Now available information shows that the summer leisure grass green mulberry green manure until the August 20 date of the turn-over period, providing a total of 7643.8 kg of green manure / mu, 46.3 kg of nitrogen accumulation / mu, spring leisurely vegetation green manure to May 11 The date of the turn-over period, can provide a total of 6685.0 kg of green manure / mu, accumulation of 34.2 kg of nitrogen / mu. After turning over green manure, the total amount of soil organic matter and nitrogen and phosphorus tended to increase, and the physical properties tended to improve. The most prominent change was the significant increase of hydrolyzed nitrogen. During the growth period after the first season of summer green manure, Nitrogen over control 22.4PPm, during the first post-spring green manure growth period, the hydrolyzed nitrogen exceeds the control 41PPm, and this trend of high hydrolysable nitrogen can be continued from the second quarter to the third quarter, the main basis for fertilizing and yield increasing This is a significant and steady increase in hydrolyzed nitrogen. Available phosphorus content in the green manure growth and turning pressure at the beginning was lower than the green manure-free zone, and later with the gradual decomposition of organic phosphorus release of green manure, phosphorus content was gradually increased, so green manure often need to cooperate with phosphorus. The average growth rate of summer and leisure plants after the first season was 196.9 kg / mu. After the second season, the yield increased by 99.2 kg / mu. After the third season, the yield increased by 144.4 kg / mu. The total output of grain was 440.05 kg / mu in the third quarter, Three quarters of total output increased 31.4%. After the fourth season to increase production disappear. Spring leisure grass mulberry green manure for the first quarter after the average yield 110.9 kg / mu, 11.5% more than the control. Summer leisure grass mulberry green manure per kilogram of green manure average grain output increased after the first quarter was 24.2 pounds, the second quarter is 12.3 pounds, the third quarter is 18.3 pounds, the sum of the three quarters, a total of 54.8 kg of grain production. Each kg of spring leisure grass mulberry green manure in the first quarter after the average increase of 16.3 kg.