000			03503nab a22003977a 4500
999			_c10540 _d10540
001			G365
003			MX-TxCIM
005			20240919020901.0
008			210630s1976 xxk|||p|op||| 00| 0 eng d
022			_a0021-8596
022			_a1469-5146 (Online)
024	8		_ahttps://doi.org/10.1017/S0021859600026654
040			_aMX-TxCIM
041	0		_aeng
043			_aGB
072		0	_aF01
090			_aCIS-401
100	1		_aFischer, R.A. _97390
245	1	0	_aYield potential in a dwarf spring wheat and response to crop thinning
260			_aUnited Kingdom : _bCambridge University Press, _c1976.
340			_aPrinted
500			_aPeer review
500			_aTables, references p. 122
520			_aExperiments with wheat describing the effects of crop thinning on grain yield and its components are presented. These were carried out over 5 years in northwest Mexico, using a high-yielding dwarf spring-wheat variety (Triticum aestivum cv. ‘Yecora 70’) grown under irrigation and high fertility. It was shown that thinning largely relieved competition for light, thus increasing photosynthate levels in the plants remaining after thinning. The objective was to evaluate this simple technique as a guide to understanding when grain yield and its components were determined and, in particular, the extent to which post-anthesis photosynthate supply limited yield. There were major responses in grain yield with thinning between about 50 and 100 days after seeding, and in number of spikes and of grains with thinning between 50 and 90 days (50% anthesis was reached at 87 days). Number of spikelets per spike showed small responses to early thinning (before 50 days). Number of grains/spikelet and kernel weight snowed positive responses to thinning between 65 and 90 days, and 90 and 115 days, respectively. These results agreed with adjacent shading and CO2 fertilization studies but, because of certain difficulties in interpretation of responses, pre-anthesis thinning was not considered a very useful technique. Anthesis thinning was carried out on 21 separate crops: the kernel weight increase relative to the unthinned control ranged from 6 to 41%, averaging 20%. Anthesis thinning led to increases in stem weight during the first half of the grain filling period, followed by increases in grain growth rate in the latter half. The increase in final kernel weight was greater with higher temperature and lower radiation during grain filling; these variables explained 64% of the variation in kernel weight response. It is suggested that the kernel weight response does indicate the degree of photosynthate limitation during grain filling, showing reasonable agreement with adjacent shading and CO2 fertilization studies. It was concluded that anthesis thinning, because of its relative simplicity, is a useful technique. Implications for yield improvement in Yecora of the results provided by this technique are discussed.
546			_aText in English
591			_aCMP|MIC 5389-R|3
650	1	7	_aHigh-yielding varieties _gAGROVOC _2 _91147
650	1	0	_aIrrigated farming
650	1	0	_aMexico _946
650	1	0	_aThinning
650	1	0	_91313 _aYields _2AGROVOC
700	1		_aLaing, D.R. _920721
773	0		_tJournal of Agricultural Science, Cambridge _n605202, 611435 _gv. 87, no. 1, p. 113-122 _dUnited Kingdom : Cambridge University Press, 1976. _wG444500 _x0021-8596
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/497
942			_cJA _2ddc _n0