Topic
Sowing
About: Sowing is a research topic. Over the lifetime, 33888 publications have been published within this topic receiving 273438 citations. The topic is also known as: seeding.
Papers published on a yearly basis
Papers
More filters
TL;DR: The root penetration rate (RPR cm/day), defined as (maximum root depth measured at or after anthesis) / (days from sowing to anthesis), emerged as a simple but unifying parameter which could be used to estimate the potential rooting depth of wheat on different soils.
Abstract: Data on wheat rooting depth was compiled from 36 agronomic experiments conducted in southern NSW from 1990 to 2004. Rooting depth was measured by direct soil coring and observation of roots using core-break or root washing techniques. Maximum rooting depth varied from 80 to 180 cm and was influenced by the depth of soil wetting, soil type and the duration of the vegetative phase (sowing to anthesis) as determined by interactions of sowing date, variety and seasonal conditions. The root penetration rate (RPR cm/day), defined as (maximum root depth measured at or after anthesis) / (days from sowing to anthesis), emerged as a simple but unifying parameter which could be used to estimate the potential rooting depth of wheat on different soils. RPR, expressed on a thermal time basis, was highly correlated with that expressed on a simpler time basis (r = 0.92). Incomplete wetting of the soil profile reduced maximum rooting depth and RPR in 12 of the 36 crops studied, and root penetration in the subsoil was clearly restricted in soil layers with less than 45 to 50% plant available water. Soil type influenced the RPR. The average RPR for wheat was 1.13 ± 0.04 cm/day on Red Kandosols (n = 11), 1.01 ± 0.07 cm/day on a Red Sodosol (n = 3) and 0.79 ± 0.03 cm/day on Red Chromosols (n = 10). The RPR was relatively constant across cultivars and sowing dates within these soil types, although there was some evidence for a reduction in RPR with later sowing independent of time or thermal time. We suggest that the RPR (cm/day) established for wheat on various soil types provides a useful tool for wheat growers to estimate the rooting depth and available water and nutrients in-season. It also provides a benchmark to indicate potential subsoil limitations to crop growth, and for researchers investigating opportunities to increase the maximum rooting depth of wheat through management or breeding.
112 citations
TL;DR: This study examined germination characteristics of seven corn hybrids under five levels of osmotic potential by polyethylene glycol (PEG) 6000 using a factorial experiment based on a completely randomized design with three replications to find the most tolerant hybrid to drought stress.
Abstract: Drought stress is one of the most important environmental factors in reduction of growth, development and production of plants. Germination is one of the main growth stages and success in this stage is dependent on moisture content of soil at time of planting. This study examined germination characteristics of seven corn hybrids under five levels of osmotic potential (0, -3, -6, -9 and -12 bar) by polyethylene glycol (PEG) 6000 using a factorial experiment based on a completely randomized design with three replications. Results indicated that water potential significantly reduced germination percent (71.2%), germination rate (24.2%), root length (60%), shoot length (89.8%), seedling length (71.2%) and seed vigour (91.7%). The mean germination time and root/shoot length ratio increased with decrease in the osmotic potential of PEG solution. Hybrid K3651/1×K166B produced the highest germination percent, germination rate, root length, seedling length and seed vigour, hence this hybrid was the most tolerant hybrid to drought stress. Key words: Corn, drought stress, early growth, germination, PEG.
111 citations
TL;DR: The lower temperatures in the early DS resulted in slower growth of rice and weeds, delaying the effects of competition, and this highlighted the importance of E. colona and C. difformis in the wet and dry seasons, respectively.
111 citations
TL;DR: The simulation results showed that sowing wheat before December can result in higher yields in the absence of waterlogging, however, the high frequency of water logging on the clay soils, showed no average yield advantage of sowing before December.
111 citations
TL;DR: Both cover-crop residues reduced density of barnyardgrass, broadleaf signalgrass, browntop millet, entireleaf morningglory, and hyssop spurge but did not affect yellow nutsedge at 7 wk after soybean planting (WAP) in the absence of herbicides.
Abstract: A field study was conducted during 1997 to 2001 on a Dundee silt loam soil at Stoneville, MS, to examine the effects of rye and crimson clover residues on weeds, soil properties, soil microbial populations, and soybean yield in conventional tillage (CT) and no-tillage (NT) systems with preemergence (PRE)-only, postemergence (POST)-only, and PRE plus POST herbicide programs. Rye and crimson clover were planted in October, desiccated in April, and tilled (CT plots only) before planting soybean. Both cover-crop residues reduced density of barnyardgrass, broadleaf signalgrass, browntop millet, entireleaf morningglory, and hyssop spurge but did not affect yellow nutsedge at 7 wk after soybean planting (WAP) in the absence of herbicides. Densities of these weed species were generally lower with PRE-only, POST-only, and PRE plus POST applications than with no-herbicide treatment. Total weed dry biomass was lower when comparing CT (1,570 kg ha−1) with NT (1,970 kg ha−1), rye (1,520 kg ha−1) with crimson ...
111 citations