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您的检索式：作者名="Clinton C.SHOCK"
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| 1 | EVALUATING QUINOA LODGING RISK AND YIELD UNDER DIFFERENT IRRIGATION THRESHOLDS, NITROGEN RATES AND PLANTING DENSITIES IN NORTH-WESTERN CHINA显示文摘Lodging is a major yield-limiting factor of quinoa production.In 2018 and 2019,the orthogonal field experiments were conducted to investigate the responses of quinoa lodging risk and yield to irrigation threshold(soil matric potential of−15,−25 and−55 kPa),nitrogen rate(80,160 and 240 kg·ha^(−1))and planting density(20,30 and 40 plants m^(−2)).Results showed that high irrigation thresholds and nitrogen rates significantly(P<0.05)increased plant height and fresh weight per plant,and high planting densities reduced stem diameter and strength,all of those led to significantly(P<0.05)high lodging risks.The−15 and−55 kPa treatments gave the lowest actual yield(P<0.05)in 2018 and 2019,respectively.Higher lodging rate with a nitrogen rate of 240 kg·ha^(−1) resulted in a lower actual yield than 80 and 160 kg·ha^(−1) in both years.Planting density of 30 plants m^(−2) gave a significantly(P<0.05)greater estimated yield than 20 plants m^(−2) and had a lower lodging rate than 40 plants m^(−2),resulting in the maximum actual yield among planting densities.In conclusion,a moderate irrigation threshold of−25 kPa,a nitrogen rate of 80−160 kg·ha^(−1) and an intermediate planting density of 30 plants m−2 were determined to be best for quinoa cultivation in North-western China.In addition,the lower-stem lodging index(quarter plant height)could evaluate lodging risk more accurately than middle-stem(half plant height)or upper-stem(three quarters plant height)lodging indexes. | Ning WANG Fengxin WANG Clinton C.SHOCK Lei GAO Chaobiao MENG Zejun HUANG Jianyu ZHAO | 2022 | Frontiers of Agricultural Science and Engineering2022，9，4： | 0 |
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