Effects of NPK Matches on the High Yield of Processing Tomato under Plastic Mulched Drip Irrigation
Abstract: In this paper, the effects of NPK matches on the yield of processing tomato were studied under Plastic Mulched Drip Irrigation. The result indicated that 1) The matches of T3 (N 300 kg•hm−2 P2O5 210 kg•hm−2 K2O 150 kg•hm−2), T5 (N 300 kg•hm−2 P2O5 105 kg•hm−2 K2O 75 kg•hm−2) were able to increase yield greatly, which reached 111,360 kg•hm−2, 111,450 kg•hm−2 respectively. But from the aspect of economic benefit, T5 (N 0 kg•hm−2 P2O5 0 kg•hm−2 K2O 0 kg•hm−2) in contrast to CK has the best economic benefit with pure income of 2487 yuan ha−1; 2) The correlation between K and lycopene is quietly close. The highest Lycopene content of T4 (N 450 kg•hm−2 P2O5 310 kg•hm−2 K2O 225 kg•hm−2) is 126.8 mg•kg−1. The minimum of CK is 89.7 mg•kg−1. Influence of N, K on titrable acidity concentration is more obvious than phosphatic fertilizer. The total content of soluble sugar has high correlation with N. The correlation coefficient is 0.986. The highest sugar content of T4 is 23.3 mg•kg−1. The minimum of CK is 18.6mg•kg−1.
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