Starter irrigation in sulla as a promising practice to climate change adaptation of Mediterranean rainfed forage systems

Abstract

Possible climate change scenarios which are projecting altered rainfall patterns and extreme events have the potential to undermine the regeneration ability of Mediterranean rainfed forage systems. Within these systems Sulla coronaria (sulla), a much appreciated short-lived Mediterranean legume, tolerates summer drought. Under a rainfed regime, sulla plants regrow due to late summer rain in the year after sowing. The research was performed in Sardinia (Italy) in order to investigate the feasibility of starter irrigation (the land was moistened to restart vegetative regeneration in a timely manner) and to evaluate the productive, environmental and economic implications of cultivating sulla. During a severe autumn drought, the starter-irrigated vs. the rainfed crop were compared. The application of the planned starter irrigation assured a prompt plant restart and positively affected the leaf traits and crop performances. In December, leaf length and area reached 42 cm and 90 cm 2 , twice the level as the rainfed leaves. Forage dry matter and crude protein yields reaching 5.2 and 1 t ha -1 were 9, 8-fold higher. Additionally, seasonal net gains of 120 kg ha -1 of fixed N, 548 kg ha -1 of saved CO 2 eq. emissions, and an economic gain of 881 € ha -1 were recorded. Starter irrigation acted as an effective adaptation strategy to climate change and supplied contextual, productive, environmental and economic benefits. K e y w o r d s: Mediterranean legume, climate change, water, CO 2 emissions, economic convenience

Wheat GSPs and Processing Quality Are Affected by Irrigation and Nitrogen through Nitrogen Remobilisation

“…Global warming and the increasingly scarce water resources are the major problems for wheat production [11]. The composition and relative proportions of glutenins and gliadins are affected by environmental factors [12,13].…”

“…Irrigation has a significant impact on wheat yield and quality. Supplemental irrigation at critical wheat growth stages increased crop yield in order to face extreme drought events [11,14]. Flour protein content increased significantly under water deficit, especially total gliadin and glutenin contents, mainly due to the higher nitrogen accumulation and lower carbohydrate accumulation [15], and the upregulated expression of storage protein biosynthesis-related transcription factors Dof and Spa [16].…”