亚热带低山丘陵区春性饲料作物与玉米不同间作系统的比较评价

COMPARATIVE EVALUATION ON DIFFERENT INTERCROPPING SYSTEMS OF SUMMER FORAGE CROPS WITH MAIZE IN SUBTROPLCAL LOW MOUNTAINOUS AND HILLY AREAS OF SOUTHWEST CHINA

１９９１～１９９４年，在四川雅安进行了几种春性饲料（小鹅草、红薯、赤豆、赤小豆、籽粒苋）分别与玉米间套作比较试验，结果表明，玉米间红薯（刈青１次或３次）两间作系统的间套作物获得了很高的饲料价值（ＤＭ５２１０～５５８０ｋｇ／ｈａ，ＴＤＯＭ３７９０～４０７０ｋｇ／ｈａ，ＣＰ６７０～７００ｋｇ／ｈａ，ＭＥ３．２２～３．４９×１０４ＭＪ／ｈａ），特别是大量代谢能；玉米间籽粒苋、赤小豆和赤豆三间作系统也获得了较高的饲料价值（ＤＭ１７５０～３３６０ｋｇ／ｈａ，ＴＤＯＭ１１１０～１４８０ｋｇ／ｈａ，ＣＰ３８０～５７０ｋｇ／ｈａ，ＭＥ０．７９～０．９８×１０４ＭＪ／ｈａ）；以上５间作系统玉米产量在稍低于对照（单作玉米），但差异不显著（Ｐ＞０．

The objective of this study was to compare and select the suitable and efficient intercropping systems of summer forage crops with maize for increasing forage production in subtropical mountainous and hilly area of south—western China.The result showed that the simultaneous crop of the two intercropping systems of maize with sweet potato for green crop of one or three times during the period from April to October each year obtained much more forage values(DM 5210～5580kg/ha,TDOM 3790～4070kg/ha,CP 670～700kg/ha,ME 3 22～3 49×10 4MJ/ha),especially the large amount of metabolizable energy.The simultaneous crop of other three intercropping systems of maize with red bean,small red bean and prince's —feather obtained also more forage values (DM 1750～3360kg/ha,TDOM 1110～1480kg/ha,CP 380～580 kg/ha,ME 0 79～0 98×10 4MJ/ha) than CK.The maize yields of five intercropping systems above were less than CK under the condition without significant diffenence between those five treatments and CK.The five intercropping systems are very useful for the practice of local farmers and the development of animal industry and the improvement of agricultural structure in subtropical zone of China.