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我国亚热带地区有大面积的冬闲水田被闲置。利用这些土地资源在冬闲期栽培意大利黑麦草（ＩＲＧ），建立“黑麦草—水稻”草田轮作（ＩＲＲ）系统，可能是解决该地区青饲料紧缺问题的最有效的方法。为了探讨该系统的可行性，在深圳光明畜牧场集约栽培条件（翻耕条播，全期施氮３００ｋｇ／ｈｍ２）下进行了ＩＲＧ的栽培试验。供试品种樱早生（极早熟）、早生丰（早熟）、早生青叶（早熟）、普通种（中熟）和双春（晚熟）均是从日本引进。对照种为燕麦。试验结果表明，ＩＲＧ各品种的平均干物质产量达到１２８８０ｋｇ／ｈｍ２，比燕麦于物质产量提高了２６％，说明ＩＲＧ能够适应我国南亚热带水田冬闲期的气候条件。ＩＲＧ各品种在集约条件下的饲料营养性状十分引人注目，其粗蛋白质含量在两次刈割时分别高达２４．１０％～２６．９９％和１８．７６％～２３．９１％。由此可见，ＩＲＲ系统的黑麦草子系统在我国南亚热带地区不仅是可行的，而且具有高效优质的特点。
A large area of winter paddy fields in the subtropical region of China is idle. The use of these land resources to grow Italian ryegrass (IRG) in winter and summer and establish a “ryegrass-rice” grassland rotation system (IRR) may be the most effective way to address the shortage of green feed in the area. In order to investigate the feasibility of this system, IRG cultivation experiments were conducted under intensive cultivation conditions (tillage and sowing, 300kg / hm2 of nitrogen during the whole period) in Shenzhen Guangming Livestock Ranch. The cultivars Yingzhaosheng (very early maturity), early growth Feng (early maturity), early green leaves (early maturity), common species (medium maturity) and Shuangchun (late maturity) were all introduced from Japan. The control species is oats. The results showed that the average dry matter yield of IRG varieties reached 12,880kg / hm2, which was 26% higher than that of oats, which indicated that IRG could adapt to the climatic conditions of winter paddy field in South China subtropical paddy fields. The feed nutrition traits of IRG under intensive conditions were very noticeable. The crude protein content of IRG reached 24.10% ~ 26.99% and 18.76% ~ 23.91% at two cutting times respectively. Thus, the IRR system of ryegrass subsystems in China’s southern subtropical region is not only feasible, but also has the characteristics of efficient and high quality.