scholarly journals Investigating constraints on direct seeding for native revegetation in the Tasmanian Midlands

2021 ◽  
Vol 22 (S2) ◽  
pp. 106-117 ◽  
Author(s):  
Tanya G. Bailey ◽  
Peter A. Harrison ◽  
Yolanda Hanusch ◽  
Claire Ranyard ◽  
Charles Hooghkirk ◽  
...  
Keyword(s):  
Direct Seeding

Dynamics of CO2 emission from chernozems under agricultural use

2017 ◽  
Vol 4 (3) ◽  
pp. 43-49
Author(s):  
M. Miroshnychenko ◽  
O. Siabruk
Keyword(s):  
Carbon Dioxide ◽  
Agricultural Practices ◽  
Growing Season ◽  
Warm Period ◽  
Direct Seeding ◽  
Soil Tillage ◽  
Plant Residues ◽  
Hydrothermal Conditions ◽  
Organic Mineral ◽  
Mineral System

Aim. The comparison of the effect of hydrothermal conditions and various agricultural practices on the emission of CO 2 from chernozems in the Left-Bank Forest-Steppe of Ukraine. Methods. The dynamics of the intensity of carbon dioxide emissions from chernozem calcic (typical chernozem – in Ukrainian classifi cation) was studied during the growing season of 2011–2012. The observations were based on two fi eld experiments with various methods of soil till- age (6–7 years from the beginning of the experiment) and fertilization systems (21–22 years from the beginning of the experiment). Particularly, plowing at 20–22 cm, disking at 10–12 cm, cultivation at 6–8 cm and direct seeding using Great Plains drill were studied among the soil tillage methods. Mineral system (N 45 P 50 K 45 ), organic system (manure 8 t/ha) and combined organic-mineral system (manure 8 t/ha + N 45 P 50 K 45 ) were studied among fertilization systems. The intensity of CO 2 fl ux was determined using the non-stationary respiratory chambers by the alkaline absorption method, with averaging of the results during the day and the frequency of once a month. Results. During the warm period, the emission of carbon dioxide from the soil changes dynamically depending on temperature and humidity. The maximum of emission coincides with the periods of warm summer showers in June-July, the minimum values are characteristic for the late autumn period. The total emission losses of carbon in chernozems over the vegetation period ranged from 480 to 910 kg/ha and varied depending on the methods of tillage ± (4.0–6.0) % and fertilization systems ± (3.8–7.1) %. The changes in the intensity of CO 2 emission from the soil under different methods of soil tillage are associated with hydrothermal regime and the depth of crop residues location. The biggest difference is observed im- mediately after tillage, but in the spring period the differences are only 12–25 %, and after drying of the top layer of soil become even less. Direct seeding technology provides the greatest emission of CO 2 from chernozem, which is fa- cilitated by better water regime and more complete mineralization of plant residues on the soil surface. Annual losses of carbon are the least under disking of soil at 10–12 cm. The changes in the intensity of CO 2 emission from the soil under different fertilization systems are associated with the involvement of the additional organic matter from plant residues and manure to the microbiological decomposition. The greatest emission was observed under the organic- mineral fertilization system, which increased the loss of carbon by 7–8 % in comparison with the mineral system in the unfavorable hydrothermal year and by 11–15 % in the more favorable year. These differences are observed mainly during the fi rst half of the growing season when there is a clear tendency to increase the intensity of soil respiration. Conclusions. The hydrothermal conditions of the warm period of the year are decisive in the formation of the CO 2 emission fl ow from chernozems. Due to the improvement of agricultural practices, emissions might be reduced but not more that by 15 % of natural factor contribution.

Effect of Non-flooded Straw-mulching Cultivation on Grain Yield and Quality of Direct-seeding Rice

2011 ◽  
Vol 37 (10) ◽  
pp. 1809-1818
Author(s):  
Zi-Chang ZHANG ◽  
Hong-Wei LI ◽  
Xue-Ming WANG ◽  
Li-Min YUAN ◽  
Zhi-Qin WANG ◽  
...  
Keyword(s):  
Grain Yield ◽  
Direct Seeding ◽  
Straw Mulching ◽  
Yield And Quality ◽  
Grain Yield And Quality

Nutrition characteristics in root surface and rhizosphere soils of direct-seeding rice in rice-duck eco-farming system

2010 ◽  
Vol 18 (6) ◽  
pp. 1151-1156 ◽  
Author(s):  
Jian-Kai SHEN ◽  
Huang HUANG ◽  
Zhi-Qiang FU ◽  
Yang-Zhu ZHANG ◽  
Pan LONG ◽  
...  
Keyword(s):  
Farming System ◽  
Root Surface ◽  
Direct Seeding ◽  
Rhizosphere Soils

scholarly journals Lessons on direct seeding to restore Neotropical savanna

2019 ◽  
Vol 138 ◽  
pp. 148-154 ◽  
Author(s):  
Alexandre B. Sampaio ◽  
Daniel L.M. Vieira ◽  
Karen D. Holl ◽  
Keiko F. Pellizzaro ◽  
Monique Alves ◽  
...  
Keyword(s):  
Direct Seeding ◽  
Neotropical Savanna

scholarly journals Effects of different mechanical direct seeding methods on grain yield and lodging resistance of early indica rice in South China

2021 ◽  
Vol 20 (5) ◽  
pp. 1204-1215
Author(s):  
Wen-xia WANG ◽  
Jie DU ◽  
Yan-zhi ZHOU ◽  
Yong-jun ZENG ◽  
Xue-ming TAN ◽  
...  
Keyword(s):  
Grain Yield ◽  
South China ◽  
Indica Rice ◽  
Direct Seeding ◽  
Lodging Resistance ◽  
Early Indica Rice

scholarly journals Luffa Gourd Production Practices from Transplanting and Direct Seeding Methods for Composite Productions

2021 ◽  
Vol 685 (1) ◽  
pp. 012024
Author(s):  
Asmah Awal ◽  
Salwa Adam ◽  
Shampazuraini Shamsuri ◽  
Nor Azma Yusuf ◽  
Nordiana Ibrahim ◽  
...  
Keyword(s):  
Direct Seeding ◽  
Production Practices

scholarly journals The influence of fencing on seedling establishment during reforestation of oak stands: a comparison of artificial and natural regeneration techniques including costs

2021 ◽  
Author(s):  
Magnus Löf ◽  
Julien Barrere ◽  
Mattias Engman ◽  
Linda K. Petersson ◽  
Adrian Villalobos
Keyword(s):  
Natural Regeneration ◽  
Recruitment Rate ◽  
Direct Seeding ◽  
Vegetation Control ◽  
Efficient Regeneration ◽  
Temperate Europe ◽  
Cost Efficient ◽  
Positive Effect ◽  
Establishment Rate ◽  
Block Experiment

AbstractIn temperate Europe, oak-dominated forests are widespread, supporting high biodiversity and providing important ecosystem services. Insufficient natural regeneration has, however, been a concern for over a century. The objective of this study was to gain insights into differences in regeneration success using artificial and natural regeneration techniques for reforestation of oak (Quercus robur L.) stands. We monitored seedlings following planting, direct seeding and natural regeneration over five years in a randomized block experiment in southern Sweden with fenced and non-fenced plots. Fencing had a strong positive effect on height growth, especially for planted seedlings that were taller than the other seedlings and more frequently browsed in non-fenced plots. In contrast, there was little effect of fencing on survival, establishment rate and recruitment rate of seedlings. Due to aboveground damage on seedlings from voles, protection of acorns did not improve establishment rate following direct seeding. Under current circumstances at the site with a sparse shelterwood of old oaks, we conclude that natural regeneration was the most cost-efficient regeneration method. It resulted in the most seedlings at the lowest cost. However, regeneration success was heavily influenced by interference from herbaceous vegetation. With a small additional investment in vegetation control, the results might have been improved for planting and direct seeding.

scholarly journals Dynamic genome-wide association analysis and identification of candidate genes involved in anaerobic germination tolerance in rice

Rice ◽  
2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ling Su ◽  
Jing Yang ◽  
Dandan Li ◽  
Ziai Peng ◽  
Aoyun Xia ◽  
...  
Keyword(s):  
Candidate Genes ◽  
Genome Wide Association Study ◽  
Expression Profiles ◽  
Oxygen Deficiency ◽  
Direct Seeding ◽  
Genome Wide Association ◽  
Genome Wide ◽  
Anaerobic Germination ◽  
Dynamic Genome ◽  
Rice Seeds

Abstract Background In Asian rice production, an increasing number of countries now choose the direct seeding mode because of rising costs, labour shortages and water shortages. The ability of rice seeds to undergo anaerobic germination (AG) plays an important role in the success of direct seeding. Results In this study, we used 2,123,725 single nucleotide polymorphism (SNP) markers based on resequencing to conduct a dynamic genome-wide association study (GWAS) of coleoptile length (CL) and coleoptile diameter (CD) in 209 natural rice populations. A total of 26 SNP loci were detected in these two phenotypes, of which 5 overlapped with previously reported loci (S1_ 39674301, S6_ 20797781, S7_ 18722403, S8_ 9946213, S11_ 19165397), and two sites were detected repeatedly at different time points (S3_ 24689629 and S5_ 27918754). We suggest that these 7 loci (−log10 (P) value > 7.3271) are the key sites that affect AG tolerance. To screen the candidate genes more effectively, we sequenced the transcriptome of the flooding-tolerant variety R151 in six key stages, including anaerobic (AN) and the oxygen conversion point (AN-A), and obtained high-quality differential expression profiles. Four reliable candidate genes were identified: Os01g0911700 (OsVP1), Os05g0560900 (OsGA2ox8), Os05g0562200 (OsDi19–1) and Os06g0548200. Then qRT-PCR and LC-MS/ MS targeting metabolite detection technology were used to further verify that the up-regulated expression of these four candidate genes was closely related to AG. Conclusion The four novel candidate genes were associated with gibberellin (GA) and abscisic acid (ABA) regulation and cell wall metabolism under oxygen-deficiency conditions and promoted coleoptile elongation while avoiding adverse effects, allowing the coleoptile to obtain oxygen, escape the low-oxygen environment and germinate rapidly. The results of this study improve our understanding of the genetic basis of AG in rice seeds, which is conducive to the selection of flooding-tolerant varieties suitable for direct seeding.

Direct-Seeding Techniques for Guayule Stand Establishment in West Texas

jpa ◽  
1992 ◽  
Vol 5 (1) ◽  
pp. 163-167 ◽  
Author(s):  
M. A. Foster ◽  
J. Moore
Keyword(s):  
Direct Seeding ◽  
Stand Establishment ◽  
West Texas
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