Effects of time, cultivation and urea on nitrogen stress and yield of wheat in a low rainfall area of Western Australia

1970 ◽  
Vol 10 (47) ◽  
pp. 763 ◽  
Author(s):  
EAN Greenwood ◽  
WJR Boyd ◽  
JA Whitehead ◽  
ZV Titmanis
Keyword(s):  
Growth Rate ◽  
Grain Yield ◽  
Nitrogen Content ◽  
Western Australia ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Vegetative Stage ◽  
Nitrogen Stress ◽  
Promising Technique ◽  
Do So

Wheat was grown where nitrogen fertilizer does not usually produce a large increase in grain yield. Urea was applied at sowing at rates from 0-75 kg N per hectare and the crop was sown either after cultivation or without cultivation but with the weed controlled with herbicides-a promising technique for earlier planting. Estimates of weeds and growth, nitrogen content, nitrogen stress, and grain yield of the crop were made at appropriate times. Maximum nitrogen stress occurred during tillering. The response by grain yield to urea was small and could be explained only in part by the relatively low values of nitrogen stress at that time. Where cultivation was replaced by herbicides, nitrogen stress was greater and growth rate, nitrogen uptake and grain yield were lower. Application of 75 kg N/ha at sowing compensated for lack of cultivation during the vegetative stage but did not fully do so for grain yield.

Starter Nitrogen Fertilizer Affects Rice Growth and Nitrogen Uptake but Not Grain Yield

cftm ◽  
2018 ◽  
Vol 4 (1) ◽  
pp. 1-5
Author(s):  
Jason M. Satterfield ◽  
Gurpreet Kaur ◽  
Bobby R. Golden ◽  
John M. Orlowski ◽  
Timothy W. Walker
Keyword(s):  
Grain Yield ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Rice Growth

Effect of lupin management on the yield of subsequent wheat crops in a lupin-wheat rotation

1985 ◽  
Vol 25 (3) ◽  
pp. 603 ◽  
Author(s):  
A Petch ◽  
RW Smith
Keyword(s):  
Grain Yield ◽  
Nitrogen Content ◽  
Western Australia ◽  
Treatment Effects ◽  
Nitrogen Availability ◽  
Mineral Nitrogen ◽  
Control Treatment ◽  
Soil Nitrate ◽  
Soil Mineral ◽  
Soil Mineral Nitrogen

Wheat was grown in a series of 1:1 rotation cycles with sweet lupins over 8 years on three sites in Western Australia. Grain yield of wheat was the main test used to compare five lupin management treatments with a control treatment, 'no-lupins'. The lupins were cut as for silage, cut as for hay, or harvested as mature grain, the stubble being burnt or removed in summer, or turned into the soil the next autumn. Nitrogen taken up in the lupins and in the wheat was measured, as well as soil mineral nitrogen in the top 10 cm in the final year. Lupin yield and nitrogen content within any year were similar over all treatments. As much nitrogen was removed in hay and silage as in mature lupins, but wheat yielded most grain after the 'silage' and 'hay' treatments, and least after 'no-lupins' or after the 'remove' and 'turn-in' stubble treatments. Nitrogen uptakes in young wheat plants point to treatment effects due to differences in nitrogen availability, but the treatments also caused different weed populations which at least partially affected wheat yields. Herbicide control of encroaching weeds in the lupins raised soil nitrate levels the following summer and increased subsequent wheat yields.

Long-term Productivity of Intensive Rice Cropping Systems on the Central Plain of Thailand

1977 ◽  
Vol 13 (4) ◽  
pp. 305-315 ◽  
Author(s):  
J. J. Walcott ◽  
M. Chauviroj ◽  
A. Chinchest ◽  
P. Choticheuy ◽  
R. Ferraris ◽  
...  
Keyword(s):  
Grain Yield ◽  
Short Duration ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Dry Matter ◽  
Cropping Systems ◽  
Dry Season ◽  
Multiple Cropping ◽  
Rice Cropping Systems

SUMMARYThe productivity of seven multiple rice-cropping systems, utilizing a short-duration cultivar under irrigation, were assessed over 5 years. Systems of one, two and three crops a year were compared. Multiple cropping reduced grain yield, panicles m-2, total dry matter and nitrogen uptake per crop. However, the unfertilized three-crop-per-year system averaged 9·1 t grain, 17·1 t DM and 126 kg N ha-1 per annum, without showing a long term decline in productivity. Recovery and utilization of nitrogen fertilizer were generally low compared to other experiments, and were highest for the early dry season cropping period.

The growth and development of some barley varieties in response to irrigation and nitrogen fertilizer

1969 ◽  
Vol 72 (3) ◽  
pp. 467-474 ◽  
Author(s):  
E. J. M. Kirby
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Leaf Area ◽  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Specific Growth ◽  
Leaf Growth ◽  
Specific Rate ◽  
High Fertility ◽  
Area Index

SUMMARYIn an experiment to investigate growth in relation to nitrogen concentration and nitrogen uptake, Proctor was compared with four other varieties of barley at two levels of irrigation and two levels of nitrogen fertilizer by means of weekly samples throughout the growing season. The varieties were Deba Abed, a new variety recommended for high fertility conditions where feeding quality grain is required, and three exotic varieties, chosen for their high concentration of nitrogen in the grain.Irrigation stimulated tillering, although certain varieties responded more strongly than others; irrigation also led to a higher specific growth rate. Certain of the exotic varieties had high growth rates early in the season but growth fell off earlier due to earlier ear emergence. Maximum leaf area index was greater in the irrigated treatment at the high nitrogen fertilizer level. The adapted varieties had higher maximum leaf area indices than the exotic varieties, although some of the exotics had higher rates of leaf area growth early in the season; there were also differences in the way in which the varieties responded to irrigation. Irrigation and variety both affected the rate at which the percentage nitrogen in the shoot fell with time.Analysis of these data indicates that nitrogen uptake early in the season was an important factor determining the total amount of nitrogen taken up by the plant. It was also shown that the relative rate of decline of the specific growth rate and the specific rate of nitrogen uptake differed between varieties. Analysis of the specific growth rate indicated that differences in leaf growth, rather than net assimilation rate, led to the varietal differences. The differential response to irrigation is discussed with reference to drought resistance.

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