球茎甘蓝鲜、干重变化及需肥规律的研究

STUDY ON THE FRESH AND DRY WEIGHT CHANGES ANDNUTRIENTS UPTAKING RULE OF KOHLRABI

研究了球茎产量在６０５８８．２ｋｇ／ｈｍ２条件下，球茎甘蓝植株鲜重、干重的增长动态及Ｎ，Ｐ，Ｋ，Ｓ的吸收规律。结果表明：植株鲜重、干重在出苗后７６～９０ｄ生长最快；平均每生产１０００ｋｇ球茎植株需吸收Ｎ３．２８ｋｇ，Ｐ２Ｏ５１．９４ｋｇ，Ｋ２Ｏ３．１７ｋｇ，Ｓ１．０６ｋｇ（比例为１．００∶０．５９∶０．９７∶０．３２）；植株吸收的Ｎ，Ｐ２Ｏ５，Ｋ２Ｏ主要贮存在球茎内，Ｓ则主要贮存在叶内；植株对Ｎ的吸收高峰在出苗后６１～７５ｄ，对Ｐ２Ｏ５，Ｋ２Ｏ和Ｓ的吸收高峰均在出苗后７６～９０ｄ。

he growth trend of fresh weight and dry weight of the kohlrabi and the uptaking rule of N,P,K and S with the corm yield of 60 588.2 kg/hm2 were studied.the results showed as follows:the growth of the plant fresh weight and dry weight reached its peak at the plant age of 76～90 days,on the average for producing 1 000 kg corm,3.28 kg N,1.94 kg P2O5,3.17 kg K2O and 1.06 kg S (at the ratio of 1.00∶0.59∶0.97∶0.32)were uptaken.N,P and K were mainly stored in corm and S in leaves.The peak of uptaking stage of the N was at the plant age 61～75 days and P2O5,K2O,S at the plant age 76～90 days.