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New Mexico State University (2019)

Observed and Simulated Response of Winter Canola to Different Irrigation Strategies in the Southern High Plains of the USA

Singh, Paramveer

Titre : Observed and Simulated Response of Winter Canola to Different Irrigation Strategies in the Southern High Plains of the USA

Auteur : Singh, Paramveer

Université de soutenance : New Mexico State University

Grade : Master of Science (MS) 2019

Description partielle
Declining water resources are major concerns for agriculture all over the world. One is in the Southern High Plains (SHP), where extensive water withdrawal for irrigation purposes has led to a sharp decline in water levels of the Ogallala aquafer. The SHP is characterized by semi-arid climatic conditions and have low-rainfall events. In these circumstances, agriculture relies heavily on irrigation to achieve reasonable crop yields. Water-intensive crops such as maize and sorghum are commonly grown in the region which have largely contributed to existing water shortage problem. It is important to adopt alternative low-water consuming crops such as winter canola and efficient irrigation strategies to reduce irrigation inputs. Therefore, this study was conducted to evaluate winter canola under different irrigation strategies. The objectives of this study were to : (1) assess growth and yield formation of winter canola under different irrigation strategies, (2) evaluate water extraction patterns of winter canola under different irrigation management practices, and (3) evaluate CSM-CROPGRO-Canola to simulate growth and seed yield of winter canola. The field experiment was conducted at Clovis, New Mexico during 2016-17 and 2017-18. A strip-plot design with split-split arrangement and four replications was used. Two levels of dormant period irrigation were the main plot treatments— dormant irrigation (DI) and no dormant irrigation (NDI). Four growth-stage based irrigation treatments were sub plot factors — fully irrigated (Irr), no irrigation at vegetation stage (VStss), no irrigation at reproductive stage (RStss), and rainfed (RD). Three cultivars as sub-sub-plot— Hekip, Riley, and DKW-46-15. Compared to NDI, seed yield was increased by 41% and 31% in DI during 2016-17 and 2017-18, respectively. Irr treatment produced highest biomass and seed yield, followed by VStss. Reproductive period was the most susceptible growth stage to water stress. Compared to Irr, RStss decreased seed yield by 40% and 30%, and compared to VStss, yield reduction was 28% and 13% in 2016-17 and 2017-18, respectively. Early maturing DKW46-15 produced lower seed yield as compared to late maturing Hekip and Riley. Pods per plant was the most sensitive yield component to water stress. Irr and VStss reported similar WUE in both years. Overall, refilling soil profile during dormant period was beneficial, and vegetative stage provides a time period where irrigation can be restricted without significant yield loss. A field-calibrated neutron probe (Model 503 DR, Campbell Pacific Nuclear Inc., CA, USA) was used to take soil moisture measurements.

Présentation (NMSU Library)

Aperçu document (ProQuest)

Page publiée le 12 octobre 2020