Effects of soil water potential on the nitrate content and the yield of lettuce

dc.contributor.author	Aggelides, S	en
dc.contributor.author	Assimakopoulos, I	en
dc.contributor.author	Kerkides, P	en
dc.contributor.author	Skondras, A	en
dc.date.accessioned	2014-06-06T06:43:56Z
dc.date.available	2014-06-06T06:43:56Z
dc.date.issued	1999	en
dc.identifier.issn	00103624	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1569
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0032935574&partnerID=40&md5=c3cd1f505f71cc6631f71e4602bf1c13	en
dc.subject.other	nitrate	en
dc.subject.other	water	en
dc.subject.other	article	en
dc.subject.other	clay	en
dc.subject.other	food quality	en
dc.subject.other	irrigation (agriculture)	en
dc.subject.other	lettuce	en
dc.subject.other	plant growth	en
dc.subject.other	plant leaf	en
dc.subject.other	soil	en
dc.subject.other	temperature	en
dc.subject.other	water content	en
dc.subject.other	weight	en
dc.title	Effects of soil water potential on the nitrate content and the yield of lettuce	en
heal.type	journalArticle	en
heal.publicationDate	1999	en
heal.abstract	In order to investigate the effect of soil water tension (SWT) on the nitrate content and yield of lettuce, an experimental field was established on a clay loam soil in Southern Greece. Scheduling irrigation by tensiometers and/or porous blocks, water was applied in each of the four treatments when the SWT reached -30, -60, or -100 kPa, respectively. The fourth treatment was irrigated by using local plant and soil criteria. Lettuce fresh yield was increased as SWT was increased with maximum fresh wt at the SWT of -30 kPa. The highest water-use efficiency was obtained at the SWT of -100 kPa. The nitrate content in the external leaves was about 3.5 to 4 times higher than the content in the heart leaves of lettuce. Furthermore, the nitrate content from -30 to -100 kPa treatment was decreased 26% for the external and 23% for the heart leaves in dry matter and 22% and 19% in fresh matter, respectively. The total nitrogen (N) of the external leaves was decreased with decreasing soil water potential and remained constant in the heart leaves.	en
heal.journalName	Communications in Soil Science and Plant Analysis	en
dc.identifier.issue	1-2	en
dc.identifier.volume	30	en
dc.identifier.spage	235	en
dc.identifier.epage	243	en