Phenophases, morphophysiological indices and cutting time in clones of the forage cacti under controlled water regimes in a semiarid environment

The behavior of three emergent aquatic macrophytes under different water regimes was studied with the aim of achieving reconvertion of degraded wetlands and wetland construction for water quality improvement. Scirpus californicus, Typha subulata and Zizaniopsis bonariensis establishment was evaluated under a split plot design, in a factorial experiment with three levels of a water regime factor over a subsoil substratum. The stagnant 10±2 cm water level was best suited to T. subulata and Z. bonariensis development and S. californicus developed better at oscillating water level (3±2 cm) with flooding at 48 hour intervals. The morphological response variables (thickness and width at half length of the tallest leaf or stem per plant, height of tallest leaf or stem per plant, number of green leaves or stems and number of shoots per plant, and survival of propagules' original leaves or stems) were satisfactory descriptors to differentiate (p<0.1%) growth of above ground parts as related to water regimes and species. The three species did survive satisfactory in subsoil-like substratum under the tested water regimes. Mortality was in the worse case, 17.2%, 36.7%, and 9.4% for S. californicus, T. subulata, and Z. bonariensis, respectively. Although Z. bonariensis growth was very poor, only S. californicus and T. subulata could be indicated for planting under similar limiting conditions.

Download Full-text

REDISTRIBUTION OF INFILTRATION BY A LARGE LANDFILL IN A SEMIARID ENVIRONMENT AND EFFECT ON WATER AND CONTAMINANT MIGRATION IN A THICK VADOSE ZONE

10.1130/abs/2017am-305976 ◽

2017 ◽

Author(s):

Arun K. Wahi ◽

◽

Rainer Senger ◽

Nazmul Hasan ◽

Kearn P. Lee

Keyword(s):

Vadose Zone ◽

Contaminant Migration ◽

Semiarid Environment

Download Full-text

Responses of a C3 and a C4 perennial grass to elevated CO2 and temperature under different water regimes

Global Change Biology ◽

10.1111/j.1365-2486.1996.tb00047.x ◽

1996 ◽

Vol 2 (1) ◽

pp. 35-47 ◽

Cited By ~ 49

Author(s):

H. W. HUNT ◽

E. T. ELLIOTT ◽

J. K. DETLING ◽

J. A. MORGAN ◽

D.-X. CHEN

Keyword(s):

Elevated Co2 ◽

Perennial Grass ◽

Water Regimes ◽

Elevated Co2 And Temperature

Download Full-text

Quinoa for the Brazilian Cerrado: Agronomic Characteristics of Elite Genotypes under Different Water Regimes

Plants ◽

10.3390/plants10081591 ◽

2021 ◽

Vol 10 (8) ◽

pp. 1591

Author(s):

Patrícia Carvalho da Silva ◽

Walter Quadros Ribeiro Junior ◽

Maria Lucrecia Gerosa Ramos ◽

Sonia Maria Costa Celestino ◽

Alberto do Nascimento Silva ◽

...

Keyword(s):

Grain Quality ◽

Winter Season ◽

Field Conditions ◽

Water Restriction ◽

Water Regimes ◽

Agronomic Characteristics ◽

Relative Water ◽

Different Seasons ◽

The Relationship

Quinoa stands out as an excellent crop in the Cerrado region for cultivation in the off-season or irrigated winter season. Here, we tested the effects of different water regimes on the agronomic characteristics, physiology, and grain quality of different elite quinoa genotypes under field conditions. The experiment was conducted under field conditions at Embrapa Cerrados (Planaltina, DF, Brazil). The experimental design was in randomized blocks, in a split-plot scheme, with four replications. The plots were composed of 18 quinoa genotypes and modified BRS Piabiru (the currently used genotype), and the split-plots were divided into 4 different water regimes. The following variables were evaluated: productivity and productivity per unit of applied water (PUAA), plant height, flavonoids, anthocyanins, gas exchange, chlorophyll, leaf proline, and relative water content. Our results showed that water regimes between 309 and 389 mm can be recommended for quinoa in the Cerrado region. CPAC6 and CPAC13 presented the highest yield and PUAA under high and intermediate WRs, and hence were the most suitable for winter growth under irrigation. CPAC17 is most suitable for off-season growth under rainfed conditions, as it presented the highest PUAA under the low WRs (247 and 150). CPAC9 stood out in terms of accumulation of flavonoids and anthocyanins in all WRs. Physiological analyses revealed different responses of the genotypes to water restriction, together with symptoms of stress under lower water regimes. Our study reinforces the importance of detailed analyses of the relationship between productivity, physiology, and water use when choosing genotypes for planting and harvest in different seasons.

Download Full-text

Rice straw application with different water regimes stimulate enzymes activity and improve aggregates and their organic carbon contents in a paddy soil

Chemosphere ◽

10.1016/j.chemosphere.2021.129971 ◽

2021 ◽

Vol 274 ◽

pp. 129971

Author(s):

Ibrahim Mohamed ◽

Mohamed A. Bassouny ◽

Mohamed H.H. Abbas ◽

Zhan Ming ◽

Cao Cougui ◽

...

Keyword(s):

Organic Carbon ◽

Rice Straw ◽

Paddy Soil ◽

Water Regimes ◽

Enzymes Activity ◽

Straw Application

Download Full-text

Stabilization Effects of Mn(II)-Salts on Metaschoepite in Soil under Different Water Regimes

ACS Earth and Space Chemistry ◽

10.1021/acsearthspacechem.1c00213 ◽

2021 ◽

Author(s):

Fuyu Guo ◽

Georgio Proctor ◽

Steven L. Larson ◽

John H. Ballard ◽

Heather M. Knotek-Smith ◽

...

Keyword(s):

Water Regimes

Download Full-text

High Phosphorus Acquisition and Allocation Strategy Is Associated with Soybean Seed Yield under Water- and P-Limited Conditions

Agronomy ◽

10.3390/agronomy11030574 ◽

2021 ◽

Vol 11 (3) ◽

pp. 574

Author(s):

Yun-Yin Feng ◽

Jin He ◽

Yi Jin ◽

Feng-Min Li

Keyword(s):

Water Stress ◽

Water Supply ◽

Seed Yield ◽

Soybean Seed ◽

Dry Weight ◽

Water Regimes ◽

P Acquisition ◽

Application Rates ◽

Soybean Genotypes ◽

Water Treatments

Both water stress and P deficit limit soybean seed yield, but the effects of water regimes and P application rates, their interaction on P status, acquisition, and partitioning, and their roles in yield performance have not been well-studied. Two soybean genotypes (Huangsedadou (HD) and Zhonghuang 30 (ZH)) with contrasting seed yield and root dry weight (DW) were used to investigate the P status, P acquisition, P partitioning, and yield formation under two water regimes (well-watered (WW) and cyclic water stress (WS)) and three P rates (0 (P0), 60 (P60), and 120 (P120) mg P kg−1 dry soil). The results show that increased P and water supply increased the seed yield, shoot and root DW and P concentrations and accumulations in different organs. Cultivar ZH had a significantly higher seed yield than HD at P60 and P120 under WS and at P0 under WW, but a lower seed yield at P60 and P120 under WW. Cultivar ZH had a significantly higher P harvest index and P acquisition efficiency, but a significantly lower shoot and root DW than HD. The interaction between water treatments and P rates had significant effects on leaf and stem P concentration. Cultivar ZH had significantly lower P partitioning to leaves and stems but significantly higher P partitioning to seeds than HD. The seed yield was positively correlated with leaf and seed P accumulations and P acquisition efficiency under WS. We conclude that (1) adequate water supply improved the P mobilization from leaves and stems at maturity, which may have improved the seed yield; and (2) the high P acquisition efficiency is coordination to high P partition to seeds to produce a high seed yield under water- and P-limited conditions.

Download Full-text