Under-trellis cover crop and planting density to achieve vine balance in a humid climate

2018 ◽  
Vol 227 ◽  
pp. 65-74 ◽  
Author(s):  
A. Coniberti ◽  
V. Ferrari ◽  
E. Disegna ◽  
M. Garcia Petillo ◽  
A.N. Lakso
1998 ◽  
Vol 88 (6) ◽  
pp. 536-543 ◽  
Author(s):  
N. Ntahimpera ◽  
M. A. Ellis ◽  
L. L. Wilson ◽  
L. V. Madden

A rain simulator, with generated rains of 11 and 30 mm/h, was used to determine the effect of a cover crop or intercrop on the splash dispersal of Colletotrichum acutatum conidia. Dispersal through sudangrass, which can be used as a ‘living mulch’, was tested at two planting densities (140 or 280 kg/ha) and two heights (5 and 20 cm) and compared with a control consisting of a bare soil. Dispersal of C. acutatum conidia was assessed by counting colonies formed from spore-bearing splash droplets deposited in sheltered petri plates containing a selective medium. Both a cover crop and rain intensity significantly affected splash dispersal as measured by the interpolated total number of colonies (denoted by Σ) from 0 to 72 cm from the inoculum source and in a time span of 61 min of generated rain (P < 0.001). However, there was no significant interaction of cover crop and intensity (P > 0.90). Dispersal with a 30-mm/h rain was higher than dispersal with a 11-mm/h rain, and presence of a cover crop significantly reduced dispersal compared with bare soil (P < 0.001). Of the treatments with sudangrass, cover crop planting density did not affect dispersal overall, but there was greater spore dispersal with the taller sudangrass at the higher planting density, due in part to the higher rate of water splashing with the tall grass compared with the short grass. Spore deposition in the petri plates could be functionally related to distance and time using a diffusion-type model, and parameter estimates could be used to explain the effects of cover crop on Σ. Although the relationship between cover crop properties and splash dispersal is complex, results show the potential beneficial effects of the cover crop on disease management.


2020 ◽  
Vol 150 ◽  
pp. 02001
Author(s):  
Amal Kabbour ◽  
Latifa Mouhir ◽  
Mohamed Laaouan ◽  
Mustapha El Hafidi ◽  
Laila Saafadi

Wastewater treatment is a global environmental issue. In Morocco, 45% of wastewater is treated before its discharge. Their impact on the environment is further aggravated by the degradation or absence of the sewerage liquid system. The constructed wetlands are alternative systems for the treatment of wastewater. Therefore, the aim of this study was to evaluate period adaptation (60 days) of a substitute plant Renealmia alpinia, and its potential for treating wastewater generated by the campus of the National Office of Electricity and Drinking Water (ONEE) of Rabat. A pilot experimental setup (tank) was constructed. The pumping rate was adjusted to 0.7 m3 / h while the density of R. alpinia planting on the surface of the filter massif was 6 plants/m2. At the end of monitoring, planting density was superior of 30, and R.alpinia plants have completed this phase clearly without any disease symptoms present. The treated water obtained from outlet and wastewater were analysed for various water quality parameters such as Biological oxygen demand (BOD), Chemical oxygen demand (COD) and Suspended solids (SS). The vertical system is able to remove 49 % of BOD, 80 % of COD, 88 % of SS. The results obtained are within the permissible limits for domestic rejects according to National legislation of Morocco. Overall results demonstrated that the selected plant posses a high potential for treating wastewater, it could represent a sustainable and inexpensive biotechnological strategy for untreated wastewater.


2017 ◽  
pp. 339-348
Author(s):  
A. Coniberti ◽  
V. Ferrari ◽  
E. Disegna ◽  
A.N. Lakso ◽  
M. García Petillo

2019 ◽  
Author(s):  
YJ Yoon ◽  
KJ Lee ◽  
JH Yi ◽  
YM Mo ◽  
GW Lee ◽  
...  
Keyword(s):  

2017 ◽  
pp. 44-54
Author(s):  
Zenaida Gonzaga ◽  
Warren Obeda ◽  
Ana Linda Gorme ◽  
Jessie Rom ◽  
Oscar Abrantes ◽  
...  

Okra or Lady’s finger, botanically known as Abelmoschus esculentus (L.) Moench, is a tropical and sub-tropical indigenous vegetable crop commonly grown for its fibrous, slimy, and nutritious fruits and consumed by all classes of population. It has also several medicinal and economic values. Despite its many uses and potential value, its importance is under estimated, under-utilized, and considered a minor crop and little attention was paid to its improvement. The study was conducted to evaluate the effects of different planting densities and mulching materials on the growth and yield of okra grown in slightly sloping area in the marginal uplands in Sta. Rita, Samar, Philippines. A split-plot experiment was set up with planting density as main plot and the different mulching materials as the sub-plot which were: unmulched or bare soil, rice straw, rice hull, hagonoy and plastic mulch. Planting density did not significantly affect the growth and yield of okra. Regardless ofthe mulching materials used, mulched plants were taller and yielded higher compared to unmulched plants. Moreover, the use of plastic mulch resulted to the highest total fruit yield. The results indicate the potential of mulching in increasing yield and thus profitability of okra production under marginal upland conditions.


2005 ◽  
Vol 53 (4) ◽  
pp. 405-415 ◽  
Author(s):  
P. Janaki ◽  
T. M. Thiyagarajan

Field experiments were conducted during 1998 and 1999 in June-September with rice variety ASD18 at the wetland farm, Tamil Nadu Agricultural University, Coimbatore, India to find out theeffect of N management approaches and planting densities on N accumulation by transplanted rice in a split plot design.The main plot consisted of three plant populations (33, 66 and 100 hills m-2) and the sub-plot treatments of five N management approaches. The results revealed thatthe average N uptake in roots and aboveground biomass progressively increased with growth stages. The mean root and aboveground biomass Nuptake were 26.1 to 130.6 and 6.4 to 17.8 kg ha-1, respectively. The N uptake of grain and straw was higher in theSesbania rostratagreen manuring + 150 kg N treatment, but it was not effective in increasing the grain yield. The mean total N uptake was found to be significantly lower at 33 hills m-2(76.9 kg ha-1) and increased with an increase in planting density (100.9 and 117.2 kg ha-1at 66 and 100 hills m-2density). N application had a significant influence on N uptake and the time course of N uptake in all the SPAD-guided N approaches. A significant regression coefficient was observed between the crop N uptake and grain yield. The relationship between cumulative N uptake at the flowering stage and the grain yield was quadratic at all three densities. The N uptake rate (µN) was maximum during the active tillering to panicle initiation period and declined sharply after that. In general, µNincreased with an increase in planting density and the increase was significant up to the panicle initiation to flowering period.thereafter, the N uptake rate was similar at densities of 66 and 100 hills m-2.


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