Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 2. Effect of rate and source of phosphorus fertilizer

1978 ◽  
Vol 18 (93) ◽  
pp. 564 ◽  
Author(s):  
RJK Myers
Keyword(s):  
Field Experiments ◽  
Grain Sorghum ◽  
Northern Territory ◽  
Diammonium Phosphate ◽  
Yield Response ◽  
Growth Stages ◽  
Growth Responses ◽  
Triple Superphosphate ◽  
Monoammonium Phosphate ◽  
Nitrogen And Phosphorus

Field experiments were conducted at Katherine, Northern Territory, in 1970-71 and 1971 -72 to examine responses of dryland grain sorghum to applied phosphorus at different growth stages. In the first, the effect of rate of application up to 100 kg P ha-1 as triple superphosphate was investigated. Growth responses to phosphorus were noted from mid-elongation onwards, but the magnitude of response varied between seasons, being greater in the higher rainfall season 1970-71. Maximum yields of grain were 7730 kg ha-1 with 50 kg P ha-1 in 1970-71, and 4440 kg ha-1 with 100 kg P ha-1 in 1971-72, which were increases of 49 and 37 per cent respectively over the appropriate zero phosphorus treatment. These suggested an increased requirement for phosphorus over previous recommendations. Phosphorus reduced the time from emergence to anthesis from 68 to 60 and from 70 to 63 days respectively in the two seasons. About half of the plant phosphorus was taken up after anthesis. It was concluded from soil analysis that phosphate-treated plots had an enhanced supply of phosphorus throughout the period of crop growth. In the second study, four phosphorus sources (superphosphate, triple superphosphate, monoammonium phosphate, and diammonium phosphate) were compared. With 25 kg P ha-1 and with constant nitrogen, grain yield response followed the order superphosphate > monoammonium phosphate > diammonium phosphate > triple superphosphate in both years. Triple superphosphate tended to give lower dry matter yields and nitrogen and phosphorus concentrations than the other three sources.

Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 1. Effect of rate of nitrogen fertilizer

1978 ◽  
Vol 18 (93) ◽  
pp. 554 ◽  
Author(s):  
RJK Myers
Keyword(s):  
Nitrogen Fertilizer ◽  
Field Experiments ◽  
Nitrogen Concentration ◽  
Balance Sheet ◽  
Grain Sorghum ◽  
Northern Territory ◽  
Grain Weight ◽  
Nitrogen And Phosphorus ◽  
Nitrogen Response ◽  
Applied Nitrogen

Responses of dryland grain sorghum to applied nitrogen were examined in three field experiments at Katherine, Northern Territory, in 1969-70, 1970-71 and 1971-72. Rates of nitrogen up to 89 kg ha-1 in the first season and up to 200 kg ha-1 in subsequent seasons were used. The crops were sampled at floral initiation, mid-elongation, anthesis, and maturity. The three growing seasons were rated as below average, above average and average, respectively, for grain sorghum production. Nitrogen response was strongly season-dependent, Maximum yields (adjusted to 14 per cent moisture) were: 1969-70, 2280 kg ha-1, with 22.4 kg N ha-1 applied (with lower yields at higher rates of nitrogen) ; 1970-71,7730 kg ha-1 with 150 kg N ha-1 applied; and 1971-72,4440 kg ha-1 with 200 kg N ha-1 applied. These represented increases of 6, 50, and 62 per cent, respectively, over the zero nitrogen treatments. Applied nitrogen increased grain numbers per head and individual grain weight, but had no significant effect on head numbers. Applied nitrogen increased yields of nitrogen and phosphorus in plant material, and increased nitrogen concentration in plant parts. Apparent recoveries of nitrogen fertilizer ranged from 0 to 40 per cent, depending on year and rate applied. An approximate balance sheet suggested substantial losses from the mineral nitrogen pool in 1970- 71, a year of above average rainfall. Significant interactions between nitrogen and phosphorus fertilizer occurred only with grains per head and thousand grain weight.

Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 3. Effect of nitrogen carrier, time and placement

1978 ◽  
Vol 18 (95) ◽  
pp. 834 ◽  
Author(s):  
RJK Myers
Keyword(s):  
Ammonium Nitrate ◽  
Ammonium Sulphate ◽  
Field Experiments ◽  
Grain Sorghum ◽  
Northern Territory ◽  
Nitrogen And Phosphorus ◽  
Rooting Zone ◽  
Loam Soil ◽  
Dry Soil ◽  
Moisture Conditions

Different nitrogen carriers, and placements and strategies of application to dryland grain sorghum growing in a clay loam soil were compared in field experiments at Katherine, Northern Territory. The nitrogen carriers were ammonium sulphate, ammonium nitrate, urea and anhydrous ammonia ; placements were banding, mixing into the topsoil, and broadcasting; and strategies consisted of split application, and varying time of broadcasting. The rate used throughout was 50 kg N ha-1.Responses to the various treatments varied between the two seasons (1970-71, 1971-72) due to differing soil moisture conditions. There was a response to broadcasting nitrogen after emergence, giving higher grain yield and nitrogen yield than earlier broadcasting or application with the seed. Banded nitrogen (both seasons) and split nitrogen (one season) were superior to other methods of applying nitrogen with the seed. The only yield differences between sources of nitrogen were with broadcast application, where ammonium sulphate proved superior in one season, and with respect to apparent recovery of nitrogen by the crop, when the order ammonium nitrate > ammonium sulphate > urea was observed in both seasons. It is suggested that in this environment and on this soil, nitrogen is not particularly susceptible to volatilization, and broadcasting urea and ammonium fertilizer onto dry soil may retain nitrogen within the rooting zone, in comparison with nitrate, which is more susceptible to leaching. Incorporated fertilizer is more susceptible to nitrification and subsequent leaching, while banded nitrogen appears to resist nitrification and leaching.

Cotton Growth and Yield Response to Simulated 2,4-D and Dicamba Drift

2009 ◽  
Vol 23 (4) ◽  
pp. 503-506 ◽  
Author(s):  
John D. Everitt ◽  
J. Wayne Keeling
Keyword(s):  
Good Predictor ◽  
Field Experiments ◽  
Yield Loss ◽  
Lint Yield ◽  
Growth And Yield ◽  
Yield Response ◽  
Growth Stages ◽  
Cotton Lint ◽  
Late Season ◽  
Crop Injury

Field experiments were conducted in Hale Co., TX, in 2005 and 2006 to determine the effects of 2,4-D amine and dicamba applied at varying rates and growth stages on cotton growth and yield, and to correlate cotton injury levels and lint yield reductions. Dicamba or 2,4-D amine was applied at four growth stages including cotyledon to two-leaf, four- to five-leaf, pinhead square, and early bloom. Dicamba and 2,4-D amine were applied at 1/2, 1/20, 1/200, and 1/2000 of the recommended use rate. Crop injury was recorded at 14 days after treatments and late-season, and cotton lint yields were determined. Across all growth stages, 2,4-D caused more crop injury and yield loss than dicamba. Cotton lint was reduced more by later applications (especially pinhead square) and injury underestimated yield loss with 2,4-D. Visual estimates of injury overestimated yield loss when 2,4-D or dicamba was applied early (cotyledon to two leaf) and was not a good predictor of yield loss.

An appraisal of the National Reactive Phosphate Rock Project

1997 ◽  
Vol 37 (8) ◽  
pp. 1085
Author(s):  
D. J. Reuter
Keyword(s):  
Expert System ◽  
Phosphate Rock ◽  
Field Experiments ◽  
Water Soluble ◽  
Annual Rainfall ◽  
Yield Response ◽  
Triple Superphosphate ◽  
Reactive Phosphate ◽  
Independent Field ◽  
Reactive Phosphate Rock

Summary. An expert system has been developed, using the results from the National Reactive Phosphate Rock Project, to determine whether reactive phosphate rock is likely to be an effective substitute for water-soluble superphosphate fertiliser for a given pasture environment. The evaluation is made from site information [annual rainfall, pasture composition and the likelihood of phosphorus (P) leaching], and soil information (pH, Colwell P, soil colour and field texture). The expert system can determine the effectiveness of both highly reactive and moderately reactive phosphate rocks. Observed substitution values of triple superphosphate for the highly reactive North Carolina phosphate rock (ratio of the respective P levels required to produce 50% of the maximum observed yield response to triple superphosphate) were closely related to values predicted by the expert system (r = 0.92); the relationship between observed and predicted substitution values of single superphosphate for the moderately reactive Hemrawein phosphate rock was also close (r= 0.86). The expert system gives one of 4 different recommendations for reactive phosphate rock based on the magnitude of the predicted substitution values. These are ‘immediately effective’, ‘effective in the medium term’, ‘marginally effective’, and ‘not effective’. The system was validated using the results from independent field experiments that provided measures of the effectiveness of reactive phosphate rock at different pasture sites.

Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 4. 15-nitrogen studies on nitrogen carrier and method of application

1979 ◽  
Vol 19 (99) ◽  
pp. 481 ◽  
Author(s):  
RJK Myers
Keyword(s):  
Ammonium Nitrate ◽  
Ammonium Sulphate ◽  
Field Experiments ◽  
N Uptake ◽  
Poor Performance ◽  
Nitrogen Sources ◽  
Grain Sorghum ◽  
Nitrogen And Phosphorus ◽  
Significant Treatment ◽  
Effective Source

The effect of nitrogen source and method of application on yield and N uptake of dryland grain sorghum was studied, using 15-nitrogen labelled fertilizers. The nitrogen sources were ammonium sulphate, ammonium nitrate and urea, and the methods were banded, mixed and split application, using a rate of 50 kg N ha-1 throughout. The experiment was conducted over two wet seasons, 1970-71 and 1971-72. Method of application increased yield and nitrogen uptake in the order banded > mixed > split. Source of nitrogen resulted in the order ammonium sulphate = ammonium nitrate > urea. In the drier season, urea behaved somewhat differently, i.e. banded urea > banded ammonium nitrate= banded ammonium sulphate. Calculation of percentage recovery in general confirmed these results. It was concluded that nitrogenous fertilizer is more effective when banded, and that urea was a less effective source of nitrogen than the two ammonium salts. The results obtained with 15-nitrogen revealed a significant treatment effect that was not apparent in non-tracer experiments namely, the poor performance of urea in the second year. Because of its greater sensitivity, and because it identifies the nitrogen derived from fertilizer, the 15-nitrogen technique has scope for use in field experiments comparing fertilizers and cultural techniques.

Agronomic studies on the productivity of kenaf (Hibiscus cannabinus L. cv. Guatemala 4) under rainfed and irrigated conditions in the Northern Territory

1990 ◽  
Vol 30 (3) ◽  
pp. 395 ◽  
Author(s):  
RC Muchow ◽  
JD Sturtz ◽  
MF Spillman ◽  
GE Routley ◽  
S Kaplan ◽  
...  
Keyword(s):  
Field Experiments ◽  
Plant Density ◽  
Northern Territory ◽  
Growth And Yield ◽  
Stem Length ◽  
Yield Potential ◽  
Yield Response ◽  
Rainfall Season ◽  
Wide Range ◽  
Average Rainfall

Field experiments were conducted at Berrimah, Douglas Daly and Katherine in the Northern Territory (NT) during the 1987-88 and 1988-89 wet seasons to obtain yield data for kenaf (Hibiscus cannabinzis L. cv. Guatemala 4) grown under rainfed and irrigated conditions. Under rainfed conditions, maximum stem yield was obtained from sowings early in the wet season. Yield decreased with delay in sowing until the late-December-January period. The maximum rainfed stem yield at Katherine in an above-average rainfall season was 18 400 kg/ha. The maximum yield in a below average rainfall season was 11 700 kg/ha at Katherine, 9200 kg/ha at Douglas Daly and 9400 kg/ha at Berrimah. The applicability to the NT of growth and yield relationships established for irrigated kenaf in the Ord Irrigation Area (OIA) was assessed. The yield potential under irrigated conditions in the NT (21 600 kg/ha at 131 days after sowing) was higher than that reported elsewhere in Australia for the same growth period, but similar to that reported elsewhere for longer growth duration (180-300 days). In the NT, in contrast to the OIA, stem yield showed little or no response to N fertilisation. Stem yield was not related to N uptake, and at high levels of N application, there was marked N accumulation in the stem. Kenaf was able to accumulate up to 110 kg N/ha from the soil reserve where no N was applied. The yield response to plant density varied with the yield level and was similar to that in the OIA. Bark and core yield could be estimated directly from biomass, and indirectly from stem length and plant density, over a wide range of yield levels and cultural conditions. It was concluded that data relating to yield potential and response to N fertilisation cannot be transferred directly from the OIA to the NT.

Building an expert system to advise on the use of reactive phosphate rock on Australian pastures

1997 ◽  
Vol 37 (8) ◽  
pp. 1077 ◽  
Author(s):  
P. Gillard ◽  
P. W. G. Sale ◽  
S. B. Tennakoon
Keyword(s):  
Expert System ◽  
Phosphate Rock ◽  
Field Experiments ◽  
Water Soluble ◽  
Annual Rainfall ◽  
Yield Response ◽  
Triple Superphosphate ◽  
Reactive Phosphate ◽  
Independent Field ◽  
Reactive Phosphate Rock

Summary. An expert system has been developed, using the results from the National Reactive Phosphate Rock Project, to determine whether reactive phosphate rock is likely to be an effective substitute for water-soluble superphosphate fertiliser for a given pasture environment. The evaluation is made from site information [annual rainfall, pasture composition and the likelihood of phosphorus (P) leaching], and soil information (pH, Colwell P, soil colour and field texture). The expert system can determine the effectiveness of both highly reactive and moderately reactive phosphate rocks. Observed substitution values of triple superphosphate for the highly reactive North Carolina phosphate rock (ratio of the respective P levels required to produce 50% of the maximum observed yield response to triple superphosphate) were closely related to values predicted by the expert system (r = 0.92); the relationship between observed and predicted substitution values of single superphosphate for the moderately reactive Hemrawein phosphate rock was also close (r= 0.86). The expert system gives one of 4 different recommendations for reactive phosphate rock based on the magnitude of the predicted substitution values. These are ‘immediately effective’, ‘effective in the medium term’, ‘marginally effective’, and ‘not effective’. The system was validated using the results from independent field experiments that provided measures of the effectiveness of reactive phosphate rock at different pasture sites.

scholarly journals Characterization of rice cultivar response to florpyrauxifen-benzyl

2020 ◽  
pp. 1-11
Author(s):  
Hannah E. Wright ◽  
Jason K. Norsworthy ◽  
Trenton L. Roberts ◽  
Robert Scott ◽  
Jarrod Hardke ◽  
...  
Keyword(s):  
Field Experiments ◽  
Rice Cultivar ◽  
Growth Chamber ◽  
Yield Response ◽  
Growth Stages ◽  
Research Station ◽  
Rice Cultivars ◽  
Visible Injury ◽  
Pine Tree ◽  
Temperature Regimes

Abstract Many factors such as environment, herbicide rate, growth stage at application, and days between sequential applications can influence the response of a crop to herbicides. Florpyrauxifen-benzyl is a new broad-spectrum, POST herbicide that was commercialized for use in U.S. rice production in 2018. Field experiments were conducted in 2018 at the Pine Tree Research Station (PTRS) near Colt, AR, and the Rice Research and Extension Center (RREC), near Stuttgart, AR, to evaluate crop injury and yield response of three rice cultivars to sequential applications of florpyrauxifen-benzyl. Greenhouse and growth chamber experiments were conducted at the Altheimer Laboratory in Fayetteville, AR, to evaluate cultivar responses when florpyrauxifen-benzyl was applied at 30 or 60 g ae ha−1 to rice exposed to different temperature regimes or at various growth stages. Three rice cultivars were used in all experiments: long-grain variety ‘CL111’, medium-grain variety ‘CL272’, and long-grain hybrid cultivar ‘CLXL745’. CL111 exhibited sufficient tolerance to florpyrauxifen-benzyl with only 10% visible injury and no effect on yield. CL272 showed 15% injury 3 wk after the second application in the field experiment when applications were made 14 d apart. Additionally, 12% injury was observed in greenhouse studies when florpyrauxifen-benzyl was applied at 30 g ae ha−1, averaged over various growth stages at application. Florpyrauxifen-benzyl did not reduce the yield of CL272 in field experiments, indicating that CL272 can recover from florpyrauxifen-benzyl injury. As much as 64% injury was observed for CLXL745 at 3 wk after application (WAA) when sequential herbicide applications were made 4 d apart. High levels of injury occurred in the growth chamber and greenhouse studies for this cultivar as well. Sequential applications of florpyrauxifen-benzyl reduced yields of CLXL745 in nearly all treatments. Data from these experiments suggest that CL272 and CLXL745 are sensitive to sequential applications of florpyrauxifen-benzyl. Growers must follow the prescribed guidelines for using florpyrauxifen-benzyl in these cultivars and others like it.

Parthenium weed (Parthenium hysterophorus) competition with grain sorghum under arid conditions

2020 ◽  
Vol 56 (3) ◽  
pp. 387-396
Author(s):  
Ali A. Bajwa ◽  
Ahmad Nawaz ◽  
Muhammad Farooq ◽  
Bhagirath S. Chauhan ◽  
Steve Adkins
Keyword(s):  
Field Experiments ◽  
Block Design ◽  
Growth Yield ◽  
Field Studies ◽  
Grain Sorghum ◽  
Growth Stages ◽  
Growth Duration ◽  
Weed Density ◽  
Free Treatment ◽  
Parthenium Weed

AbstractParthenium weed is an invasive species in a growing number of countries where it infests numerous crop fields, including sorghum. Two field studies were conducted to quantify the effect of parthenium weed on the performance of grain sorghum at different weed densities (0, 5, 10, 15 and 20 plants m−2) and durations of weed-crop competition (season-long weed-free, weed-free after 2, 4, 6 or 8 weeks, and season-long weedy). Our aim was to identify the density threshold and ideal duration to control parthenium weed in sorghum fields. Both field experiments were planned in a randomised complete block design each with three replications in 2016 and were repeated in 2017. Parthenium weed biomass increased significantly with increasing density and competition duration. The increasing parthenium weed density had a linear negative effect on sorghum growth, yield and yield-contributing traits. The highest yield loss, of up to 66%, was recorded at the highest parthenium weed density of 20 plants m−2 when compared to weed-free treatment. In addition, the season-long competition of this weed with sorghum caused 81% reduction in grain yield over weed-free treatment. According to our results, parthenium weed should be managed below a density of 5 plants m−2 and throughout the crop growth duration in grain sorghum fields as it can cause serious yield losses even at low densities and through strong competition at early as well as late growth stages of the crop.

Response of Acetolactate Synthase–Resistant Grain Sorghum to Nicosulfuron Plus Rimsulfuron

2010 ◽  
Vol 24 (4) ◽  
pp. 411-415 ◽  
Author(s):  
D. Shane Hennigh ◽  
Kassim Al-Khatib ◽  
Mitchell R. Tuinstra
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Field Experiments ◽  
Acetolactate Synthase ◽  
Grain Sorghum ◽  
Yield Reduction ◽  
Growth Stages ◽  
Visible Injury ◽  
Leaf Stage ◽  
Sorghum Grain

The lack of POST herbicides to control grasses in grain sorghum prompted researchers to develop acetolactate synthase (ALS)–resistant grain sorghum. Field experiments were conducted to evaluate the differential response of ALS-resistant grain sorghum to POST application of nicosulfuron + rimsulfuron applied at three growth stages. ALS-resistant grain sorghum was treated with 0, 13 + 7, 26 + 13, 39 + 20, 52 + 26, 65 + 33, 78 + 39, and 91 + 46 g ai ha−1of nicosulfuron + rimsulfuron when plants were at the three- to five-leaf, seven- to nine-leaf, or 11- to 13-leaf stage. In general, as nicosulfuron + rimsulfuron rates increased, visible injury increased at the three- to five-leaf and seven- to nine-leaf stages. Injury was greatest 1 wk after treatment for the three- to five-leaf and seven- to nine-leaf stages across all ratings, and plants then began to recover. No injury was observed at any rating time for the 11- to 13-leaf stage. Plant height and sorghum grain yield were reduced as nicosulfuron + rimsulfuron rates increased when applied at the three- to five-leaf stage. However, nicosulfuron + rimsulfuron applied at the seven- to nine-leaf and 11- to 13-leaf stages did not decrease sorghum yield. This research indicated that nicosulfuron + rimsulfuron application at the three- to five-leaf stage injured ALS-resistant grain sorghum; however, application at the seven- to nine-leaf or 11- to 13-leaf stages did not result in grain yield reduction.

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