小粒型优质野败不育系绮A的选育与应用

绮A是广西农科院水稻所育成的极小粒型野败不育系，千粒重仅14g，具有败育彻底，异交习性良好，可恢性，配合力高，外观品质好等特点。2001年10月通过广西区科技厅成果鉴定。所配组合表现米质优、优势强、产量高、熟期偏中迟。绮优1025、绮优99和绮优293等优质早灿组合的配组成功，有望解决华南杂交早灿稻米质差的问题。     

优质杂交晚稻新组合百优1025

百优1025是广西农科院水稻所用小粒型软米不育系百A与优质强恢复系桂1025配组育成的三系感光型杂交稻组合,全生育期约119 d,一般产量7.5 t/hm2,稻米品质优,达国标2级优质稻谷(GB/T 17891-1999)标准,属软米类型,米饭软滑,清香爽口,冷后不回生.2007年5月通过广西农作物品种审定,可在桂南稻作区和桂中稻作区南部种植博优桂99的地区作晚稻种植.     

优质杂交早籼组合绮优293的选育

绮优293为小粒型中熟早籼组合,产量高,品质优,早晚稻主要品质指标均达国标优质米标准,2005年通过广西品种审定委员会审定.     

小粒型优质强恢复系桂1025的选育及利用

小粒型恢复系桂1025是用粳稻、爪哇稻和籼稻强恢复系多交育成,千粒重17 g,具有恢复力强、配合力高、品质优等特点。用桂1025配制的秋优1025、博优1025、美优1025、特优1025、培两优1025、六优1025、绮优1025、天优1025等组合已通过广西品种审定,其中秋优1025和博优1025还通过了国家品种审定。     

杂交水稻新组合绮优926

绮优926是广西农科院植物保护研究所用绮A与桂926配组育成的三系杂交水稻新组合,具有株叶型好、抗病性较强、产量较高等特点,适宜在桂南稻作区作早稻及在中稻地区种植,2006年2月通过广西区农作物品种审定委员会审定。     

高产优质杂交水稻新组合恒丰优1899的选育

恒丰优1899是广西农业科学院水稻研究所用优质不育系恒丰A和自育恢复系桂恢1899选育成的籼型高产优质杂交水稻新组合。该组合具有株型集散适中、剑叶内卷直立、穂大粒多、灌浆快、高产稳产、优质、适应性好等特点，于2021年通过广西农作物品种审定委员会审定，可在广西桂南、桂中和桂北稻区作早、晚稻种植。     

优质杂交水稻新组合百优429

百优429是广西农科院水稻所利用小粒软米型优质不育系百A与早熟新恢复系R429配组育成的感温型软米早熟杂交水稻新组合,具有早熟、优质、稳产等特点,可在广西桂中、桂北稻作区作早、晚稻种植。于2013年6月通过广西农作物品种审定。     

弱感光型优质杂交晚籼稻新组合先红优826的选育

先红优826是广西农业科学院水稻研究所以先红A为母本，桂826为父本配组育成的弱感光型优质杂交晚籼稻新组合，2020年6月通过广西壮族自治区农作物品种审定委员会审定。该组合食味及稻米品质优、抗倒伏、适应性广，适合在广西桂南稻作区、桂中南部适宜种植弱感光品种的区域作晚稻种植。     

小粒软米型籼稻不育系百A的选育及应用

百A是以小粒型优质保持系秋B作母本,软米型籼稻品种浙农8010作父本杂交制保后与秋A测交、回交转育而成的优质软米型不育系.该不育系花粉以典败为主,败育彻底,柱头外露率高,异交习性好,对"九二○"敏感;可恢性好,配合力高;分蘖力强;谷粒细长,千粒重14～15 g,品质优.所配组合以感光类型为主,且稻米品质优.其中,百优1025(百A/桂1025)和百优1191(百A/桂1191)分别于2007和2008年通过广西品种审定.     

优质杂交晚籼新组合协优978

协优978(皖稻127号)是以协青早A与自育优质恢复系R978配组而成的优质三系杂交晚籼新组合,该组合产量高、抗稻瘟病、米质优,全生育期118～120 d,与协优92相仿,适宜沿江双季稻区作晚稻种植.2004年3月通过安徽省品种审定委员会审定.     

SILAGE AND MILK PRODUCTION. A COMPARISON BETWEEN A DIPLOID AND A TETRAPLOID RYEGRASS

Two grass silages made in May and two made in August were compared in a 16-week winter-feediag experiment with 12 Ayrshire cows. The silages were fed ad lib. with a supplement of barley and groundnut cake. One of the silages made ia May and one made in August consisted of S24, a diploid variety of perennial ryegrass, and the other two of Reveille, a tetraploid variety of the same species. The silages made from Reveille had a higher content of lactic acid and a lower pH than those made from S24. The contents of digestihie organic matter in the silage DM made in May and August were 71.9 and 63.2%, respectively, for RevelUe and 68.7 and 60.9% for S24. Silage and total DM intakes were higher in the treatments where Reveille silages rather than S24 silages were fed. The mean daily milk yields from cows fed on the silages made in May and August were 39.6 and 34.5 lb (18.0 and 15.7 kg), respectively, for Reveille, and 38.0 and 34.1 lb (17.3 and 15.5 kg) for S24. The solids-not-fat (S.N.F.) and the crude protein contents of the milk averaged 8.64 and 3.29%, respectively, for Reveille, and 8.56 and 3.22% for S24. It is concluded (hat the silages made from Reveille were superior to those made from S24 as a feed for dairy cows.     

A LINEAR PROGRAMMING MODEL OF A HIGH-TEMPERATURE GRASS-DRYING ENTERPRISE

A linear programming model of a high-temperature grass-drying enterprise is described. From information about seasonal crop response, area of crop available and management constraints, the model determines the harvesting schedules which give greatest returns, less costs, from the enterprise over the season. This information can be used to examine the effects of long-term strategic decisions or to evaluate economically data on new crops from field experiments. For example, assuming a fixed cost of λ70,000/year for a high-temperature grass-drying installation and what is considered to be reliable input data for 1972, the returns less costs for optimum harvest schedules from different areas or crop varieties are:

A MANAGEMENT STUDY OF A BIRDSFOOT TREFOIL STRAIN TRIAL

A study of birdsfoot trefoil ( Lotus corniculatus L.) variety trial management was conducted with three variables, variety, stubble height and harvest date. The range in maturity for the three varieties used was 12-14 days. All plots were harvested thrice per season. The harvest dates for the two management regimes imposed differed by about two weeks for the first cut, by about one week for the second and were identical for the third cut. Stubble heights were two and six inches (5.08 and 15.24 cm).
Late-cut material outyielded that cut early, but suffered more winter damage. Material cut at a stubble height of two inches (5.08 cm) outyielded that cut at six inches (15.24 cm), but it also suffered more winter-killing. The ranking of varieties varied with management.
Alternative management schemes, designed to provide maximum yields and survival consistent with good-quality forage, are proposed and discussed.     

Development of A dormancy release technology: A review

Tuber dormancy can be released immediately in many commercially important potato cultivars by brief treatment (1-2 days) with bromoethane (BE) vapor at room temperature. The development of a large scale technology for BE application and safe removal through a capturing technique is necessary for successful application of this dormancy release method. Ideally, BE treatment of seed tubers would occur in a closed environment that would capture BE vapor in an unaltered form and allow controlled release for treatment of subsequent tuber lots. Results of screening studies for adsorbents indicate that the medium capacity activated carbon adsorbent, YAO has: i) a high capacity for BE; ii) a low capacity for water; and, iii) adsorbs and de-adsorbs BE quickly and easily. A plausible design of a large scale, dormancy release facility is presented. The proposed facility should meet present goals of the seed potato industry in an environmentally responsible manner.     

A COMPARISON BETWEEN A PADDOCK SYSTEM AND A 'WYE COLLEGE' SYSTEM OF GRAZING FOR MILK PRODUCTION

Two grazing systems, a paddock system and a ‘Wye College’ system, were compared in two 20-week experiments nsing 16 and 20 spring-calved Ayrshire cows in 1970 and 1971, respectively. A sward of S23 perennial ryegrass was used, and an average of 342 kg N/ha (305 lb N/ ac) was applied per annum. The paddock system had 28 separate paddocks; one paddock was grazed each day in rotation and occasionally topped in mid-season. The Wye College system had 4 plots of equal size and the cows were offered 1/7 of one plot each day; no back fence was used and surplus herbage was neither cut nor topped. The stocking rate on hoth systems was 1 cow per 0.20 ha (0.49 ac) in 1970 and per 0.16 ha (0.40 ac) in 1971. The mean daily milk yields per cow on the paddock and the Wye College systems were 16.2 and 15.3 kg (35.7 and 33.7 lb), respectively, in 1970; and 18.1 and 18.4 kg (39.9 and 40.6 lb) in 1971. The average annual output of milk was 13,500 and 13,150 kg/ha (1200 and 1170 gal/ac) on the paddock and Wye College systems, respectively. The fat and solids-not-fat (S.N.F.) contents of the milk were not significantly affected by the grazing system. It is concluded that the Wye College system was as effective as the paddock system in producing a high output of mUk per ha, but at a lower cost and with far fewer management decisions.     

广东育成无垩白软型优质籼稻不育系粤丰A

粤丰Ａ是由广东省农科院水稻研究所于1998年育成的国内第一个无垩白、低直链淀粉含量(14.3%)、软胶稠度(92ｍｍ)、低糊化温度(碱消值7.0)和香味浓的特优籼型三系不育系。该不育系千株群体不育株率为100%,花粉不育度为99.99%,柱头外露率达88.1%,稻瘟病全群抗性比达中抗水平。2000年10月在广州通过了由来自扬州大学、国家水稻改良中心、国家杂交水稻工程技术研究中心等单位著名专家的技术鉴定。专家组一致认为该不育系综合性状优良、不育性稳定、配合力强、异交结实率高、品质改良有重大突破,研究成果达国内外领先水平;其投入生产应用对推动我…     

A Rice Reference

Rice quality:A guide to rice properties and analysis reviews variability in rice characteristics and their effects on rice quality in great detail.After an introduction on rice quality that also explores paradoxes associated with the crop,the book goes on to examine rice physical properties and milling quality.This leads to a discussion of the effects that the degree of milling has on rice quality.The ageing of rice and its cooking and eating quality are comprehensively investigated in the following chap...