设施黄瓜干物质累积及NPK吸收规律

Dry Matter Accumulation in and NPK Uptake by Non-polluted Cucumber in Protected Cultivation

以津研四号黄瓜为试材,研究设施黄瓜干物质累积及其N、P、K吸收规律。结果表明:黄瓜干物质积累主要集中在初瓜期和盛瓜期,约占全生育期干物质累积量的95%;植株与果实干物质累积的比例为1.5:1。苗期、初瓜期、盛瓜期和末瓜期N素吸收量占整个生育期吸收总量的百分比依次为2.1%、29.3%、65.2%和3.4%;P素为3.2%、32.8%、61.6%和2.4%;K素为2.3%、27.3%、66.8%和3.8%。当黄瓜的产量(鲜重)为142.5 t hm-2时,全生育期N、P、K吸收量分别为405.4、74.9和506.6kg,N、P、K吸收比例为1:0.18:1.25,生产1 t商品瓜吸收的N、P、K分别为2.84、0.53和3.55kg。

In order to investigate the laws of dry matter accumulation and uptake of NPK by non - polluted cucumber in protected cultivation, a cucumber variety （Jinyan No. 4） was chosen. The results showed that dry matter accumulation of cucumber mainly concentrated in the period from early fruit stage to mid-fruit stage, the percentage of the accumulation amount of the two stages to the total amount of the whole developmental stage was 95%. The dry matter weight ratio of plant to fruit was 1.5 ： 1. The percentages of N uptake amount at seedling, early fruit, mid - fruit and late fruit stage to the whole developmental stage were 2.1%, 29.3%, 65.2% and 3.4%, respectively. Correspondingly, the percentages of P were 3.2% , 32.8% , 61.6% and 2.4%, and the percentage of K were 2.3% ,27.3% ,66.8% and 3.8%. When the cucumber yield was 142.5t ha^-1, the uptake amounts of N, P and K were 405.4, 74.9 and 506.6kg, and the ratio of the N, P and K uptake amount was 1：0.18：1.25.