Soil Application Of Humic Acid Research Articles

Effect of foliar spray of nutrients and plant growth regulators (PGRs) for yield maximization in blackgram

An experiment was conducted during 2002 to study the morphological physiological and biochemical effects of foliar spray of nutrients and plant growth regulators on yield and productivity of blackgram. The treatments include foliar spray of 2% DAP, 0.2% Boric acid, 0.5% FeSO,, 0.5% ZnSO, 0.5% sodium molybdate, 2% urea, 0.1% humic acid, 1% KC1, Salicylic acid 100 ppm, Brassinolide 0.1 ppm and humic acid 20 kg basal application. Among these treatments, foliar spray of 2% urea recorded the highest yield of 955.2 kg/ha followed by foliar spray of KC1 1% along with soil application of humic acid 20 kg/ha (926.2 kg/ha). The yield enhancement may be due to improved morphological, physiological and biochemical parameters. The tested chemicals particularly 2% urea were found effective towards yield maximization in black gram.

STAND ESTABLISHMENT TECHNOLOGIES FOR PROCESSING CARROTS

STAND ESTABLISHMENT TECHNOLOGIES FOR PROCESSING CARROTS

Effect of humic acid on rainfed upland cotton (Gossypium hirsutum)

Input cost is increasing day-by-day and it of water at squaring and flowering stages necessitates to develop low-cost technolo- (T,), foliar spray of 0.25% humic acid at gies for higher returns, especially in rainfed squaring aAd flowering stages (T,), foliar situation. Chandrasekaran (1989) reported spray of 0.5% humic acid at squaring and that soil application of humic acid as potas- flowering stages (T,), foliar spray of 1% sium humate might influence the crop humic acid at squaring and flowering stages growth indirectly through formation of com- (T,,), seed soaking in 0.5% humic acid and plexes with ammonium rendering the nitro- foliar spray of 0.5% humic acid at squaring gen slowly available and also through the - formation of complexes with iron and zinc Table 1. Effect of humic acid on growth and yield of rendering them absorbable by the plant rainfed upland conon roots. Seed soaking in 1.5% humic acid and foliar spraying of humic acid improve the Treatment Plant Sympodial Bolls1 Seed-cotton crop growth and yield in summer- height plant plant yield (cm) (ha) irrigated cotton (Gossypium sp.) (AICCIP, Coimbatore, 1994). There is limited infor- mation regarding the use of humic acid for rainfed cotton. Hence the present study was undertaken to find out the effect of humic acid treatment on seed-cotton yield of up- land cotton (G. hirsutum L.) under rainfed situation. A field experiment was conducted during the winter season (rabi) of 1991-92 at Kovilpatti, with 12 treatments in randomized block design replicated thrice. The treatments compared were the control (T,), application of farmyard manure @ 12.5 tonneslha (T,), seed soaking in water for 12 hr (T,), seed soaking in 0.5% humic acid for 12 hr (T,), seed soaking in 1% humic acid for 12 hr (T,), seed soaking in 1.5% humic acid for 12 hr (T,), foliar spray Details of treatment are described in text