Abstract
Potassium (K) is absorbed by plants in larger amounts than any other mineral element except N to optimalize plant growth. Mulches may be influenced an available K at vegetative growth phase of plant. The research was conducted in Simpang Kanan Village, Gisting, Tanggamus Lampung Province. The objectives of this research were to study the application of KNO3 and rice hull mulch on growth and yield of kailan. Fields experiments were arranged by a factorial in a completely randomized block design with 10 treatments and 3 replications. A first factor was (1) dosages of KNO3 (150, 175, 200, 225, and 250 kg ha-1) and the second factor was mulch of the rice hull (with and without the rice hull). The results showed that the application of the rice hull did not significantly affected the yield of kailan, however the application of KNO3 till 250 kg ha-1 increased the level of greenness up to 6.10% and the wide of leaf up to 18,57%. In addition, the present of potassium fertilizer suspended with the rice hull significantly affected the width of kalian leaf. Keywords: Kailan, mulch, potassium nitrate, rice hull
Highlights
IntroductionLong Leaf) is a vegetables with a high nutrition and vitamins content
As kailan has a big potential for human consumption, effort should be made through precise cultural technique to gain optimal production
The results showed that application of mulch did not affect plant height, total number leaves, plant fresh weight, plant dry weight and plant production in each plot
Summary
Long Leaf) is a vegetables with a high nutrition and vitamins content. This crop belongs to Brassicaeae family and is one of the leave vegetables founded by the community (Yamaguchi 1983). As kailan has a big potential for human consumption, effort should be made through precise cultural technique to gain optimal production. The purposed cultural technique is the application of optimum fertilizers and mulching. The growth and yield of crops are depended on the optimal requirement of nutrient element for preparing the soil as a growing medium. Fertilizing will be done whenever the soil could not able to prepare nutrient elements in an adequate quantity for the plants. Potassium is one of the important macro elements for plant growth. Potassium is one of the important macro elements for plant growth. Oldham (2008) and Aljabri (2007) stated that the dynamic of K-forms in the soil comprises of mineral fixed K, un-exchangeable K
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