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Forage Accumulation and Radiation Use of Alfalfa Under Deficit Irrigation by Minguo Liu; Le Mu; Yixiao Lu; Huimin Yang is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract The supply of high‐quality forage is fundamental to the development of ruminant animal production in drought areas where irrigation provides strong support to the forage production. The objective was to explore the response of alfalfa (Medicago sativa L.) growth and radiation use to deficit irrigation in a 2‐yr field study. Two deficit‐irrigation treatments and a full‐irrigation control (CK) were established under flood irrigation. Growth‐related indicators and radiation use were measured regularly. Results showed that deficit irrigation reduced forage accumulation, leaf area index (LAI), plant relative water content (RWC), and radiation use efficiency (RUE) of alfalfa. Compared with CK, slight deficit irrigation (SD) and moderate deficit irrigation (MD) decreased forage accumulation rate by 20 and 30%, respectively. Logistic model as a function of growing degree days (GDD) fitted well LAI change (R^2^> .9). Deficit irrigation reduced the average rate of quick growth of LAI from 5 to 36%. Water deficit did not significantly change the GDD corresponding to the rapid growth phase but reduced the growth rate. Under deficit irrigation, decreased LAI did not always lead to s

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Author

Minguo Liu; Le Mu; Yixiao Lu; Huimin Yang

Publisher

Wiley

Published

2021

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)