{"id":{"repo_id":"lincoln","oai_identifier":"oai:researcharchive.lincoln.ac.nz:10182/3605"},"canonical_url":"https://search.dev.ndltd.org/etd/lincoln/oai:researcharchive.lincoln.ac.nz:10182/3605","repository":{"repo_id":"lincoln","name":"Lincoln University","base_url":"http://researcharchive.lincoln.ac.nz/dspace-oai/request"},"display":{"title":"Effects of polyacrylamide (PAM) and gypsum on irrigated and dryland potatoes (Solanum tuberosum L.).","abstract":"An experiment was conducted at Lincoln University to investigate the effects of irrigation, micronised polyacrylamide (PAM) and gypsum on the growth and yield of 'Ilam Hardy' potatoes in 2001-2002. At the final harvest, tuber yields were similar (59 500 kg ha⁻¹). Environmental factors dominated results, particularly January rainfall, which was 150% of the 16-year average. Economic yield (tubers> 113g) was not affected by any treatment and was >80% of total tuber yield. Premium size tubers (> 170g) were 65% of total tuber yields and no treatment affected tuber size distribution. The maximum crop growth rate was higher from irrigated (189 kg DM ha⁻¹ d⁻¹) than dryland plots (174 kg DM ha⁻¹d⁻¹). This reflected differences in leaf area index at two times during the later growth period. Mean crop growth rate, as a result, was also lower (118 kg DM ha⁻¹ d⁻¹) compared to irrigated plots (130 kg DM ha⁻¹ d⁻¹). The duration of growth was similar (125 days) for all treatments. There was no effect of any treatment on soil adherence to tubers. Aggregate stability was increased 24% by gypsum application. However, poor initial soil structure caused by years of intensive cultivation meant this only increased to 2.4% and was unlikely to have had any affect on crop growth and yield.","abstract_html":"An experiment was conducted at Lincoln University to investigate the effects of irrigation, micronised polyacrylamide (PAM) and gypsum on the growth and yield of 'Ilam Hardy' potatoes in 2001-2002. At the final harvest, tuber yields were similar (59 500 kg ha⁻¹). Environmental factors dominated results, particularly January rainfall, which was 150% of the 16-year average. Economic yield (tubers> 113g) was not affected by any treatment and was >80% of total tuber yield. Premium size tubers (> 170g) were 65% of total tuber yields and no treatment affected tuber size distribution. The maximum crop growth rate was higher from irrigated (189 kg DM ha⁻¹ d⁻¹) than dryland plots (174 kg DM ha⁻¹d⁻¹). This reflected differences in leaf area index at two times during the later growth period. Mean crop growth rate, as a result, was also lower (118 kg DM ha⁻¹ d⁻¹) compared to irrigated plots (130 kg DM ha⁻¹ d⁻¹). The duration of growth was similar (125 days) for all treatments. There was no effect of any treatment on soil adherence to tubers. Aggregate stability was increased 24% by gypsum application. However, poor initial soil structure caused by years of intensive cultivation meant this only increased to 2.4% and was unlikely to have had any affect on crop growth and yield.","abstract_has_math":false,"creators":["Mills, Annamaria"],"institution":"Lincoln University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002","date_published":"2002","updated_at":"2026-07-24T02:50:30Z","subjects":["gypsum fertiliser","aggregate stability","growth rates","irrigation","polyacrylamide (PAM)","potato","soil adherence","Solanum tuberosum","tuber size distribution","yield"],"languages":["en"],"rights":["Digital dissertation can be viewed by current staff and students of Lincoln University only."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["Q112543764"],"render_values":[{"text":"Q112543764","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/10182/3605","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Mills, Annamaria"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2002"]},{"key":"dc:publisher","label":"Institution","values":["Lincoln University"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["gypsum fertiliser","aggregate stability","growth rates","irrigation","polyacrylamide (PAM)","potato","soil adherence","Solanum tuberosum","tuber size distribution","yield"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Digital dissertation can be viewed by current staff and students of Lincoln University only."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/10182/3605","Q112543764"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An experiment was conducted at Lincoln University to investigate the effects of irrigation, micronised polyacrylamide (PAM) and gypsum on the growth and yield of 'Ilam Hardy' potatoes in 2001-2002. At the final harvest, tuber yields were similar (59 500 kg ha⁻¹). Environmental factors dominated results, particularly January rainfall, which was 150% of the 16-year average. Economic yield (tubers> 113g) was not affected by any treatment and was >80% of total tuber yield. Premium size tubers (> 170g) were 65% of total tuber yields and no treatment affected tuber size distribution. The maximum crop growth rate was higher from irrigated (189 kg DM ha⁻¹ d⁻¹) than dryland plots (174 kg DM ha⁻¹d⁻¹). This reflected differences in leaf area index at two times during the later growth period. Mean crop growth rate, as a result, was also lower (118 kg DM ha⁻¹ d⁻¹) compared to irrigated plots (130 kg DM ha⁻¹ d⁻¹). The duration of growth was similar (125 days) for all treatments. There was no effect of any treatment on soil adherence to tubers. Aggregate stability was increased 24% by gypsum application. However, poor initial soil structure caused by years of intensive cultivation meant this only increased to 2.4% and was unlikely to have had any affect on crop growth and yield."]},{"key":"dc:title","label":"Title","values":["Effects of polyacrylamide (PAM) and gypsum on irrigated and dryland potatoes (Solanum tuberosum L.)."]}]}],"canonical_facts":{"dc:creator":["Mills, Annamaria"],"dc:date":["2002"],"dc:description":["An experiment was conducted at Lincoln University to investigate the effects of irrigation, micronised polyacrylamide (PAM) and gypsum on the growth and yield of 'Ilam Hardy' potatoes in 2001-2002. At the final harvest, tuber yields were similar (59 500 kg ha⁻¹). Environmental factors dominated results, particularly January rainfall, which was 150% of the 16-year average. Economic yield (tubers> 113g) was not affected by any treatment and was >80% of total tuber yield. Premium size tubers (> 170g) were 65% of total tuber yields and no treatment affected tuber size distribution. The maximum crop growth rate was higher from irrigated (189 kg DM ha⁻¹ d⁻¹) than dryland plots (174 kg DM ha⁻¹d⁻¹). This reflected differences in leaf area index at two times during the later growth period. Mean crop growth rate, as a result, was also lower (118 kg DM ha⁻¹ d⁻¹) compared to irrigated plots (130 kg DM ha⁻¹ d⁻¹). The duration of growth was similar (125 days) for all treatments. There was no effect of any treatment on soil adherence to tubers. Aggregate stability was increased 24% by gypsum application. However, poor initial soil structure caused by years of intensive cultivation meant this only increased to 2.4% and was unlikely to have had any affect on crop growth and yield."],"dc:identifier":["https://hdl.handle.net/10182/3605","Q112543764"],"dc:language":["en"],"dc:publisher":["Lincoln University"],"dc:rights":["Digital dissertation can be viewed by current staff and students of Lincoln University only."],"dc:subject":["gypsum fertiliser","aggregate stability","growth rates","irrigation","polyacrylamide (PAM)","potato","soil adherence","Solanum tuberosum","tuber size distribution","yield"],"dc:title":["Effects of polyacrylamide (PAM) and gypsum on irrigated and dryland potatoes (Solanum tuberosum L.)."],"dc:type":["Thesis"]},"updated_at":"2026-07-24T02:50:30Z"}