Direct-seeding of rice by sowing dry seeds on dry soils often results in poor seedling emergence due to erratic rainfall. Adjusting the sowing depth to a given rainfall pattern may improve rice emergence. To assess risks of crop failure in direct-seeded rice, we developed a platform for modelling and simulation of rice emergence at different sowing depths. We combined the HYDRUS-1D soil simulation model, which simulates the surface soil’s moisture dynamics, with two rice emergence models recently developed by our research group. The platform used 48 years of daily weather data (1977–2024) for the study site as inputs for the soil model to simulate soil moisture and temperature at designated depths. We then input the simulated values and sowing depths into the emergence models to simulate final emergence and the emergence date. The simulated soil water tension at a depth of 1 cm showed huge interannual variation, reaching 10 MPa in dry years. The simulation showed that relative to a 1-cm sowing depth, depths of 4 and 6 cm greatly reduce the probability of crop failure under rainfed conditions (from 8 % to between 1 % and 2 %). Our novel platform for risk assessment should therefore facilitate the use of direct-seeded rice in suboptimal environments. The platform also fills a knowledge gap for simulation of crop establishment in direct-seeded rice under future climate scenarios.

Deficit irrigation can enhance crop water productivity (CWP; yield per water applied) but requires careful management to prevent drought-like responses that limit leaf gas exchange (i.e., water-conservative responses) and compromise yield. Grafted and ungrafted melons (Cucumis melo L.) were evaluated under three irrigation treatments: full irrigation (100 % field capacity; FC) and 70 % or 50 % deficit irrigation, based on water applied to the 100 % FC. Although deficit irrigation accentuated drought stress through the season, plants under moderate deficit irrigation (70 % FC) had similar water potential (Ψ), and only 34 and 14 % lower stomatal conductance (gs) and photosynthetic rate (Pn) than the full irrigation. Under severe deficit irrigation (50 % FC), plants had 28 and 17 % lower predawn and midday Ψ than the full irrigation. The lower plant water status of the 50 % FC resulted in water conservative-responses, and a 65 and 47 % lower gs and Pn than the 100 % FC. Yield of the 100 and 70 % FC treatments were affected by evapotranspiration demands (i.e., irrigation × year interaction), while the 50 % FC had a 40 % lower yield than the full irrigation. Moderate deficit irrigation reduced water applied by 25 % and had either a similar or a 47 % increase in CWP compared to the full irrigation. Overall, grafting improved yield by 14 %, but it was greater under full irrigation and low environmental stress. Overall, melon crop performance was maintained under a constant, moderate deficit irrigation, and this should be considered as an effective water-saving strategy for melons to cope with long-season droughts.

Special soils with extreme properties form insular habitats often supporting endemic species and unique communities. An uncertainty is how these communities may change through time, such as during periods of climatic changes including droughts. On unique, gypsum-associated soils in the Mojave Desert, USA, we examined multi-decade change in plant communities, including conservation-priority, special-status species. Within our 18-year study period, different community features and components varied in their degree of stability or change among three measurement years (2008, 2020 and 2025). Community species composition, total plant cover, cover of gypsophiles associated with gypsum, and shrub density changed little, while turnover in most perennial forbs was high. Two conservation-priority perennial forbs, Anulocaulis leiosolenus and Arctomecon californica, declined in density by 86–100% between 2008 and 2025, though the species may persist in soil seed banks and have naturally cyclic population fluctuations. Despite our study encompassing an overall multi-decade dry period and a severe 2020–2022 drought, turnover in shrubs was minimal. Although dieback occurred, multiple metrics (e.g., species rank-abundance curves) of perennial community structure were stable. Results portray these gypsum-associated communities as exhibiting high temporal turnover in perennial forbs overall, concomitant with stable shrub components and community structure.

Disentangling how forests respond to aridification in terms of carbon storage and use, including bimodal growth, is critical to forecast their mitigation potential. Bimodality, characteristic of Mediterranean trees, refers to the potential to produce a second growth peak after the dry summer, often accompanied by intra-annual wood density fluctuations (IADF). To induce IADF formation, we performed a girdling experiment on Spanish juniper (Juniperus thurifera) branches in a semi-arid site, and monitored changes in branch diameter, and measured non-structural carbohydrate (NSC) concentrations in sapwood and leaves. IADFs were formed in response to wet conditions in late summer in girdled and non-girdled branches. After girdling, the extraordinarily dry 2022 growing season hampered branch radial increment and IADF production. Girdled branches swelled more than control branches after rain pulses. This suggests girdled branches were osmotically more active. Girdled branches presented higher starch leaf concentrations, suggesting that osmolytes could proceed from starch hydrolysis upstream. Girdling did neither trigger bimodal growth nor IADF formation during a very dry year.

Irrigation can enhance yields and serve as a climate adaptation strategy. In the Southeastern U.S., where water resources are relatively abundant, irrigation has experienced significant growth. However, despite the region’s capacity for further expansion, irrigation adoption rates remain low. This study estimates the influence of peer effects on farmers’ decisions to adopt irrigation in South Carolina, using a unique parcel-level dataset on irrigation withdrawals. We find that adoption increases as farmers observe more peer adopting irrigation – social interactions – and as peers’ pumping increases, such as during drought periods, when the benefits of irrigation become more visible, facilitating social learning.

Droughts are becoming increasingly common in India, where 50 per cent of the labour force works in agriculture, and most agricultural production is rainfall-dependent. This paper investigates the extent to which rural households adapt to drought – defined as rainfall deficiency – by reallocating labour from agriculture to other sectors of the economy. We estimate a household-level fixed-effects regression model and find that household agricultural employment declines in the year following a drought. Furthermore, these effects are mediated by job skills and land ownership. We find that households with working members who have completed primary education account for most of the workers who exit the agricultural sector. In contrast, we find that households that own land increase their agricultural labour share after experiencing a drought. Thus, while we find that drought causes households to diversify away from agriculture on aggregate, the extent of this structural change is mitigated by the behaviour of landowners.

Root water transport has been viewed as primarily limited by the radial component, with the axial pathway considered highly conductive and non-limiting. This is supported by theoretical estimates of axial conductance using the Hagen–Poiseuille equation. However, increasing evidence indicates that actual axial conductance is often nearly an order of magnitude lower than predicted, challenging assumptions that it does not limit water uptake. In this review, we discuss how recent model inversion approaches, guided by root hydraulic conductance measurements, have revealed that water transport can be co-limited by radial and axial conductance. We explore possible explanations for this co-limitation, with particular attention to root topology. Finally, we highlight how drought-induced adjustments in xylem vessel traits can reduce axial conductance, contributing to water conservation and cavitation resistance, thereby supporting drought adaptation strategies. Leveraging this overlooked limitation opens new avenues for breeding crops with improved water-use efficiency and resilience to drought .

The troublesome weed Johnsongrass [Sorghum halepense (L.) Pers.] is predicted to expand its range under climate change. In the process, it is likely to become more competitive in corn (Zea mays L.) production areas of the northeastern United States and southern Canada. A replicated greenhouse experiment was conducted to measure interspecific and intraspecific competition between an S. halepense biotype from central New York State (northern range edge) and corn under drought and well-watered conditions. Drought stress significantly reduced the biomass and height of corn and S. halepense in both rounds of the experiment (P < 0.001). Drought stress increased the root-to-shoot ratio of S. halepense (P < 0.001) and reduced the root-to-shoot ratio of corn (P < 0.001). In one run of the experiment, corn produced 19.3% more aboveground biomass (P < 0.001) and 6.6% more height (P < 0.001) when competing with an S. halepense plant (interspecific competition) than when competing with a second corn plant (intraspecific competition). Drought conditions increased the advantage of corn plants grown under interspecific relative to intraspecific competition (P = 0.012). In that round of the experiment, biomass of S. halepense was 12.9% higher under intraspecific competition than interspecific competition in the well-watered treatment and 15.5% higher under intraspecific competition than interspecific competition in the drought treatment (main effect of competition, P = 0.002). Differences between competition treatments were smaller in the other round of the experiment (P > 0.05). Our findings suggest that the New York S. halepense biotype used in this study may not be as competitive as biotypes found in this weed’s range core in more southern regions of the United States. However, anticipated effects of climate change may increase the abundance and competitiveness of this species in the northeastern United States.

This article is an introduction and guide to investigating past relationships between climate and human behavior. Improving understanding of these relationships is essential as humanity confronts the challenges of our warming world. However, how to investigate potential climatic influences on human behavior in the past is rarely presented or discussed as a distinct mode of inquiry. This article aims to fill this gap by providing a practical tool kit for students, archaeologists, anthropologists, and other historically focused social scientists. It is structured as a series of seven key steps to creating a research design for a climate and human behavior study, from identifying research questions to presenting results. Most of the conceptual models, methods, data, and examples provided have worldwide relevance and are informed by the long history of climate and human behavior studies in the North American Southwest. By expanding competence in this domain, we can enrich documentation and interpretations of the past and insights will emerge that will contribute to preparing for and responding to our warming world.

This article examines the adverse impact of the La Niña phenomenon in Argentina from 1988 to 1989 on the country’s economy, which led to a profound crisis. The severe drought significantly affected agricultural exports, exacerbating poverty and inflation. The resulting economic downturn was triggered in part by the drought and precipitated a political crisis, ultimately resulting in the resignation of President Alfonsín and paving the way for the election of Carlos Menem as Argentina’s president. This study sheds light on the intricate interplay between climatic events, economic performance, and political dynamics, highlighting the vulnerability of countries heavily reliant on agriculture and emphasizing the need for comprehensive strategies to mitigate the socioeconomic consequences of natural disasters.

This article investigates the global history of dryland modernisation through the case study of southern Italy. From the early twentieth century to the fascist years, several intellectuals, scientists, and politicians reinterpreted the apparent and long-standing backwardness of this region as fundamentally due to its hydrology and climate: southern Italy was rediscovered as a dry land, formally part of Italy and civilised Europe and yet environmentally closer to extra-European spaces of empire. The article shows how Italian agrarian scientists mobilised this ‘environmental Otherness’ of the Italian south as the key to developing a ‘dryland’ science alternative to that of ‘humid’ northern Italy and continental Europe. Instead, this ‘dryland’ approach to modernisation grounded southern Italy within a vast transimperial network defined by the co-production and circulation of knowledge and technologies allowing the adaptation of modern and intensive food production to semi-arid regions. As such, the article argues that Italian agrarian scientists redefined the spatial order of the Italian south in a transimperial sense, embracing its environmental Otherness as a vantage point for its rehabilitation within Italy’s nation-building.